Administration: Revert changes to the admin menu styles for long line lengths.

This reverts [46555], [46453], and [46332].

See #42201

Upgrade/Install: Use a unique error code when an update fails due to the PHP JSON extension missing.

This allows update failures caused when the native PHP JSON extension is missing to be distinguished from updates that fail because the site does not meet the minimum PHP requirements.

Follow up of [46455].

Reviewed by desrosj, jorbin, johnbillion.
Fixes #47699.

Script Loader: Partially revert [46550] as it brought in unrelated CSS changes.

[46550] was meant to revert [46440] but it also merged some unrelated CSS changes.

See #47069.

Post WordPress 5.3 RC1 version bump

WordPress 5.3 RC1

Help/About: Let's tell the world about 5.3.

Props karmatosed, melchoyce, pierlo, ryelle, afercia, audrasjb, davidbaumwald

Thanks to everyone who provided feedback for this page for 5.3.

See #47708

Administration: Fix the appearance of update bubbles in submenus and when the admin menu is collapsed.

Props afercia, amolv, sabernhardt

Fixes #42201, #48294

Shortcodes: Revert [46369] for now to allow more time to investigate and prepare for backward compatibility changes.

Also reverts follow-up changes in [46370] and [46465].

See #47863.

Media: Similarly to `wp_get_original_image_path()` add `wp_get_original_image_url()` to always retrieve the URL to the original uploaded image.

Props kraftbj.
Fixes #48302.

Build/Test Tools: Move PHP 7.4 to the top of the list for consistency.

See #48232.

Bundled Themes: Update Twenty Twenty.

This brings `trunk`’s version of Twenty Twenty in-sync with GitHub.

For a complete list of changes since [46445], see https://github.com/WordPress/twentytwenty/compare/7246fd6...bc89c51.

Props anlino, ianbelanger, poena, williampatton, nielslange, acosmin, netweb, joyously, mahesh901122, josephscott, byalextran, amolv, Clorith.
See #48110.

Accessibility: Script Loader: Remove jQuery as dependency of `admin-bar` after [46440].

A better approach needs to be explored, as there are valid concerns for potential conflicts between different jQuery versions added by themes or plugins.

See #47069.

Accessibility: Media: Improve the Media Modal spinner position after [46418].

Fixes #47138.

Customize: Ensure that `WP_Customize_Manager::import_theme_starter_content()` properly handles starter content with (nested) arrays as values.

Previously, searching for symbol references to replace with post or attachment IDs in array values resulted in a PHP warning.

Props timph, JarretC, SergeyBiryukov.
Fixes #45484.

Build/Test: Remove PHP 7.4 from allowed failures

PHP7.4 is supported in WordPress 5.3. :elephant: :tada:

Fixes: #48232.

Block Editor: Update the WordPress Packages to the ones used in the Gutenberg 6.8 release.

Updated packages:
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]

Props gziolo, youknowriad.
Fixes: #48310

REST API: Allow for multiple Vary: Origin headers in GET responses.

Simple fix, we pass `false` as the second parameter to the header function.

This is something that we added downstream of the 5.2.4 release, but we missed in 5.2/trunk.

Fixes #48309.
Props xknown, whyisjake.

Block Editor: Remove experimental Social Links blocks

We decided to mark Social Links block as an experimental feature in Gutenberg. In effect, we are moving all related code from WordPress 5.3 release.

Props youknowriad.

Fixes #48263.

Build/Test tools use Trunk revision 2170172 of importer

Update Travis configuration to temporarily use trunk for the importer in order for PHP 7.4 tests to pass. When the new version is released, this will be updated to point to that tag.

See: #48231

Media: Do not store error messages in the image meta. The initial idea was to (be able to) display these errors in the UI but it wasn't implemented as these errors are mostly helpful for low-level bedugging.

Fixes #40439.

Uploads: Retry to post-process images after HTTP 500 and HTTP 502 errors.

Props mikeschroder, azaozz.
Fixes #47872.

Accessibility: Media: Improve the text of the Media Modal actions toggle button displayed in the responsive view.

See #47149.

Accessibility: Media: Improve the new Media Modal headings text.

See #47610.

Administration: Ensure that admin referer nonce is valid.

Fix for a testing regression.

Props desrosj.

REST API: Ensure that we don't generate warnings from sending extra headers after headers have been sent.

Fixes issues stemming from [46478].

REST API: Send a Vary: Origin header on GET requests.

Add this header on all GET requests to prevent cached requests.

Props darthhexx, davidbinda, nickdaugherty, whyisjake.

Administration: Ensure that admin referer nonce is valid.

Coding standards, ensure that nonce is valid with identical, rather then equal operator.

Props vortfu, xknown, whyisjake.

Filesystem API: Prevent directory travelersals when creating new folders.

Reject file paths that contain sub-directory paths.

Props iandunn, xknown, sstoqnov, whyisjake.

HTTP API: Protect against hex interpretation.

Return earlier from wp_http_validate_url().

Props: iandunn, xknown, voldemortensen, whyisjake.

Query: Remove the static query property.

Prevent unauthenticated views of publicly queryables content types.

Props aaroncampbell, whyisjake, nickdaugherty, xknown.

Formatting: In `wp_validate_redirect()`, normalize the path when validating the location for relative URLs, to account for Windows paths.

Props peterwilsoncc, rconde, jmmathc, mat-lipe, Sixes, justinahinon, cmagrin, daxelrod, SergeyBiryukov.
Fixes #47980.

Docs: Fix typo in a comment in `WP_REST_Settings_Controller::prepare_value()`.

Convert the comment to a multi-line format per the documentation standards.

Props itowhid06.
See #48296.

Docs: Correct documentation typo in print_emoji_detection_script().

Props itowhid06.
Fixes #48298. See #47110.

Docs: Correct comment typo in WP_REST_Terms_Controller::update_item().

Props manikmist09.
Fixes #48295. See #47110.

Docs: Fix and improve inline documentation for the HTTP API.

See #47110

Users: Make sure `wp_logout()` clears current user, so that a subsequent call to `is_user_logged_in()` works as expected.

Props sebastian.pisula, donmhico, roytanck, juliobox.
Fixes #35488.

Tests: Rename tests methods in `tests/pluggable.php` per the handbook's naming convention.

See #47632.

Docs: Adjust `@since` note in `shortcode_parse_atts()` for consistency with similar notes.

See #47863.

I18N: Don't capitalize "Extension" in `update_core()`, for consistency with other strings.

Follow-up to [46455].

See #47699.

Docs: Add `requires_php` to the list of fields returned by `plugins_api()`.

Props ediamin.
Fixes #48291.

Formatting: Make sure `wp_sanitize_redirect()` encodes spaces in URLs instead of stripping them out.

Props donmhico, hlashbrooke, dd32, azaozz.
Fixes #36998.

Media: Adds Edit Image controller to Media Library `select` frame.

This adds the necessary state for `EditImage` views in the `select` frame and listeners for setting that view.

Props fblaser, w3rkjana, afercia, antpb.
See #48028.

Administration: Prevents horizontal scroll jumping around while admin menu is open.

This sets the `#adminmenuback` `position` CSS property to `fixed`.

Props promz, man4toman.
Fixes #47010.

Media: Update fallback previews to support `_wp_make_subsizes()`

Allows fallback previews (PDF by default, in core) to save image meta
after each size is generated to allow for resuming, and make sizes
immediately available.

Props azaozz, antpb, progremzion, mikeschroder.
See #48111.

Cron: Prevent sending headers when using ALTERNATE_WP_CRON

ALTERNATE_WP_CRON echos things which causes a "Headers already sent" warning. This adds a check to ensure headers haven't already been sent.

Previously: [45560]

See: #45560. Fixes #48283.
Props dlh.

Themes: Convert core-provided starter content to block content.

Props Clorith.
Fixes #48130.

REST API: Fix error in _fields filtering logic where only one of several requested sibling properties would be included.

Props kadamwhite, TimothyBlynJacobs.
Fixes #48266.

Upgrade/Install: Detect the presence of the native PHP JSON extension before updating.

The PHP native JSON extension has been bundled and compiled with PHP by default since version 5.2.0. Because the minimum version of PHP required by WordPress is now 5.6.20 (see #46594 and [45058]), the related polyfills and workarounds have been removed (see [46205-46206,46208]).

However, even though the JSON extension is now included in PHP by default, it is still possible to disable the extension in a custom configuration. This change will prevent sites from upgrading if the JSON extension is disabled to prevent compatibility issues.

Props jrf, jorbin, dd32, desrosj.
Fixes #47699.

REST API: Do not addslash when receiving meta arrays of non-string values.

Slashing non-string data caused PUT requests containing unmodified meta arrays of integers to fail the check against the existing stored meta value, causing a 500 when posting an unmodified response body back to the server.

Props TimothyBlynJacobs, augustuswm.
Fixes #48264.

Administration: Ensure visual consistency with large titles in the sidebar.

Custom posts, and other menu titles that are long aren't wrapping correctly.

Props jagirbaheshwp, munyagu, harshbarach, hareesh-pillai, pratikkry, naveenkharwar, mukesh27, dushanthi, worldweb, audrasjb, afercia, amolv, iqbalbary, davidbaumwald.
Fixes #42201

Docs: Tweak the `@since` note in `Walker::walk()` and `::paged_walk()` for better readability and consistency with other notes.

See #47678.

Docs: Add a `@since` note about new parameters with the spread operator added to function signatures.

Props jrf.
See #47678.

Bundled Themes: Update/audit NPM dependencies for Twenty Nineteen.

Also, ignore the `node_modules` folder for Twenty Nineteen.

Fixes #48262.

Post WordPress 5.3 Beta 3 version bump.

WordPress 5.3 Beta 3.

Bundled Themes: Fix JSHint error in [46445]

Props ianbelanger.
See #48110.

Bundled Themes: Change the `eol-style` property to `native` for Twenty Twenty files.

Props aazaozz, desrosj.
See #48110.

Bundled Themes: Update Twenty Twenty.

This brings `trunk`'s version of Twenty Twenty in-sync with GitHub.

For a complete list of changes since [46357], see https://github.com/WordPress/twentytwenty/compare/7157870...7246fd6.

Props anlino, ianbelanger, poena, williampatton, nielslange, acosmin, netweb, joyusly, luminuu, itowhid06, cbravobernal, intimez, glauberglauber, ocean90, amolv, briceduclos, aristath, mukesh27, garrett-eclipse, audrasjb, afercia, dianeco, utsav72640, mahesh901122, tobifjellner.
See #48110.

Themes: Properly align Close/Previous/Next icons in theme preview overlay.

Props chetan200891.
Fixes #48248.

Themes: Adjust CSS media query for theme overlay to match the breakpoint for a folded admin menu.

Props chetan200891.
Fixes #48250.

Code Modernisation: Introduce the spread operator in `Walker::walk()` and `::paged_walk()`.

Rather than relying on `func_get_args()` to retrieve arbitrary function arguments, we can now use the spread operator to assign them directly to a variable.

This re-applies [45624] and reverts [45640], with a dev note upcoming for plugin authors to maintain backward compatibility with old versions of WordPress.

Props jrf.
See #47678.

Network Admin: Improve Site States in List Table rows.

This commit switches a comparison to a Yoda condition, performs a more strict `intval()` check on the value of the Site Status column, and prevents a specific Site State from appearing in List Table rows when filtering by that same Site State already (to match the behavior of other List Table State implementations.)

Fixes #37684. Props pbiron.

Accessibility: Script Loader: Add jQuery as dependency of `admin-bar`.

On the front end, themes that don't use jQuery make the admin bar fallback to the non-jQuery implementation. Some important features miss from the non-jQuery `admin-bar.js` part, for example `hoverintent` and, most importantly, the touch events for the mobile menu don't work at all.

Enqueueing jQuery is the simplest option for now. For the future, a complete rewriting of `admin-bar.js` in plain JavaScript is highly recommended.

See #47069.

Docs: Add missing `@deprecated` tags in the file docblock of some deprecated files.

Props jrf.
Fixes #48254.

Accessibility: Media: Improve the logic to render the ARIA tabs markup after [46363].

Additionally checks for the "menu" and "router" state attributes to better determine when the ARIA tabs pattern markup is appropriate.

See #47149.

I18N: Add context for the `Archives` string introduced in [45651] as a file type heading, to disambiguate from other types of archives.

Props alexclassroom.
Fixes #48259.

External Libraries: upgrade `mediaelement` to version 4.2.13.

Upgrade `mediaelement` to the latest version. Includes a variety of bug fixes made since the 4.2.6 release; see https://github.com/mediaelement/mediaelement/releases.

Props danieliser, Hareesh Pillai.
Fixes #46681.

REST API: Ensure rest_controller instantiates the post type's declared REST controller class.

Ensures that the ::get_rest_controller() method will always return an instanceof the expected controller class, or null.
Removes unused private static property $post_type_controllers.

Props dlh, TimothyBlynJacobs.
Fixes #45677.

REST API: Permit embedding of the 'self' link relation in the /search endpoint.

Removes a special-case prohibition against embedding 'self' which prevented ?_embed from being used with the /wp/v2/search endpoint.

Props TimothyBlynJacobs, chrisvanpatten, kadamwhite.
Fixes #47684.

REST API: Ensure users with "moderate_comments" capability may edit comments.

Props meloniq.
Fixes #47024.

Coding Standards: Correct the number of accepted arguments in `add_action()` calls in `wp-includes/default-filters.php` for functions that don't accept any arguments.

Props itowhid06, johnbillion, jrf.
Fixes #48123.

CSS Coding Standards: Use unitless values for `line-height` in `wp-includes/css/media-views.css`.

Follow-up to [45478].

Props ianbelanger, afercia.
Fixes #46529. See #44643.

Twenty Fourteen: Replace overly broad float-clearing selectors with more specific ones, to avoid unintentionally targeting elements generated by plugins.

Props ianbelanger, iandunn, karmatosed.
Fixes #35779.

Twenty Fourteen: Ensure the content after the Read More tag is visible and has the appropriate padding.

Props ianbelanger, sabernhardt, slobodanmanic, Quantumstate, Gwendydd, andraganescu, francina.
Fixes #28967.

Pings/Trackbacks: Remove a failing test that won't pass as long as `WP_IMPORTING` gets set during tests.

The `_publish_post_hook()` function checks for `WP_IMPORTING` before setting meta fields fir enclosures and pings, which means this test is doomed to fail.

The test can be re-implemented if the `WP_IMPORTING` constant gets moved to a function similar to how `wp_installing()` works for the `WP_INSTALLING` constant.

See #48014

Pings/Trackbacks: Fix processing of posts with pending enclosures.

Introduced in [46175].

Fixes #36824

Pings/Trackbacks: Avoid adding multiple `_pingme` and `_encloseme` meta entries to a post when it gets updated prior to pings being done.

Props rebasaurus, whyisjake

Fixes #48014

Accessibility: Improve and modernize user interface controls: Revert the new links focus style.

Thew new dotted outline for the links focus style introduced in [46241] doesn't appear to be ready to guarantee a good indication of focus.
It was agreed to restore the previous links focus style and postpone exploration for a new style to the next release cycle.
Partially reverts [46241] and [46293].

See #34904, #47153.

Docs: Miscellaneous inline docs corrections and improvements.

See #47110

Accessibility: Improve and modernize user interface controls: Improve the buttons active CSS class.

- improves the buttons `.active` CSS class for buttons that need to be styled as "pressed"
- update the alternate color schemes `.active` CSS class accordingly
- improves a few icons colors in the alternate color schemes

See #34904.

REST API: Add support for continuing the post-processing of images after upload. Flow:

1. `POST /wp/v2/media`.
2. If the upload failed (HTTP 500 error), look for a response header with `X-WP-Upload-Attachment-ID` header that contains the newly created attachment ID.
3. `POST /wp/v2/media/{id}/post-process` with `{ "action": "create-image-subsizes" }`. This request may still fail, but it will save its progress.
4. On continued failure, `DELETE /wp/v2/media/{id}` to give up on the upload and instruct the user to resize their image before uploading.

Props TimothyBlynJacobs.
Fixes #47987.

Upload: Set custom header with the attachment ID for all uploads from `media_handle_upload()`. Let the REST API endpoint set it separately.

Props timothyblynjacobs.
Fixes #48200.

Coding Standards: Fix WPCS issues in `wp-includes/ms-deprecated.php`.

Props itowhid06.
Fixes #48237.

Accessibility: Improve and modernize user interface controls for better contrast: Further improvements to input heights and alignments.

- improves input fields height in the customizer
- improves input fields height for Internet Explorer 11
- improves input fields height in the Image Editor
- improves alignment of selects and buttons in the privacy policy pages
- makes the search themes fields font-size consistent

Props garrett-eclipse, afercia.
See #47477.

Accessibility: Media: Improve the search media field labelling.

Visible `<label>` elements benefit all users. The `placeholder` attribute should not be used as a replacement for visible labels.
Instead, it's supposed to be used only for a short hint to aid users with data entry e.g. a sample value or a brief description of the expected format.

Screen readers may not announce a `placeholder` attribute at all. Other users may suffer from the lack of a visible label and a placeholder used as replacement, for example:

- users with cognitive disabilities may have trouble remembering what the filled field does
- speech recognition users cannot see the name they can speak to set focus on the field
- low-vision users with high text-size may not be able to see the whole placeholder even when it's visible, if its value is clipped by the edge of the input

Props anevins, audrasjb, karmatosed, azaozz, SergeyBiryukov, afercia.
See #40331.
Fixes #47138.

Accessibility: Login and Registration: Improve the invalid username and invalid email messages.

- explicitly informs users they can use their email to log in as an alternative to their username and vice-versa
- shows the `Lost your password?` link only when an wrong password has been entered
- uses a more appropriate copy by changing "invalid" to "unknown"
- removes the all caps `ERROR`

Props subrataemfluence, zalak151291, ryokuhi, SergeyBiryukov, audrasjb, joedolson, marybaum, ramiy, markjaquith, chanthaboune, afercia.
Fixes #43037.

External Libraries: Fix PHP 7.4 compatibility issue in the Requests library.

Moves https://github.com/rmccue/Requests/pull/370 into WordPress.

Previous [46258].

See #47746.

Coding Standards: Fix WPCS issues in `WP_Widget_Links` and `WP_Widget_Pages`.

Props itowhid06.
Fixes #48228.

Tests: Use a consistent group for nav menu tests.

Fixes #48230.

Menus: In `Walker_Nav_Menu`, `Walker_Category`, and `Walker_Page`, properly output link attributes having a legitimate "empty" value, for example an HTML data attribute with a value of zero (0).

Props nevma, AkSDvP, greenshady, SergeyBiryukov.
Fixes #47720.

Privacy: Ensure that sending email, and remove data follow the same user experience.

Both personal data request processes should follow the same convention.

Fixes: #43974.
Props: garrett-eclipse, kjellr, Kerfred, birgire, marybaum, SergeyBiryukov.

Administration: Add a max-width to the Privacy Policy Page dropdown.

If there's a page with an extra long title, the Privacy Policy page dropdown in Privacy Settings overflows the page width.

Fixes #47366
Props garrett-eclipse, SergeyBiryukov, mukesh27, desrosj, adhitya03, jalpa1984, nrqsnchz, paresh07.

Docs: Format comments in `wp-admin/includes/plugin.php` as per the documentation standards.

Props dkarfa.
Fixes #48191.

Build/Test: Update Grunt Uglify options

Follow up to [46408]

Sometimes you need to take documentation literally. And sometimes you need to take it seriously. Deprecations and replacements in uglify are a case where I took them literally and should have taken them seriously.

See #48203.

Build/Test: Bump devDependencies for WordPress 5.3

This upgrades a number of devDependencies.  Some of these include changes to how the tasks are configured.

Uglify: There are deprecated options from 2.x to 4.x, see: https://github.com/gruntjs/grunt-contrib-uglify#options

Autoprefixer: Browserslist now warns when passing in the browser list, so that is put into package.json

As with most changes to uglify, this changes every minified JS file.

Fixes #48203.

Taxonomy: Prevent Parent Category dropdown and field descriptions on Categories and Edit Category screens from extending beyond the other fields.

Props garrett-eclipse, dkarfa.
Fixes #48188.

Build/Test tools: Update grunt-contrib-imagemin and run it

Smaller images are good, so is not having npm vulnerabilities.

See #48203.
Fixes #48206.
Props whyisjake, netweb.

Build/Test Tools: Fork and Update `grunt-replace`

The version of grunt replace that is bundled in core is using an outdated version of lodash that is bringing 2 low, 3 high, and 1 critical issue. This package is currently abandoned. There is a community forked version, but that is also harboring some similar security issues.

This switches to a fork by @whyisjake and causes no change to the build.

See #48203.
Fixes #48217.
Props whyisjake, netweb for testing.

Site Health: Improve the wording for `UTF8MB4` test description.

Props garrett-eclipse, chetan200891, johnjamesjacoby, ayeshrajans.
Fixes #48044.

Customize: Remove duplicate `attr_title` assignment in `api.Menus.MenuItemControl.renderContent()`.

See #47838.

Filesystem API: Use strict type check in the `in_array()` call for the `$skip_list` parameter in `copy_dir()` and `_copy_dir()`.

This ensures that parent folders with a numeric name are not accidentally skipped when only a subfolder is intended to be skipped.

Props codex-m.
Fixes #46581.

Docs: Correct formatting of the `@return` value description in `_wp_handle_upload()`.

See #47110.

Docs: Add missing documentation for the first parameter of the `big_image_size_threshold` filter.

Props dkarfa, desrosj, earnjam.
Fixes #48214.

Emoji: Revert [46393] pending test failure investigation.

See #46537.

Comments: Remove a one-time variable in `wp_rel_nofollow()` and `wp_rel_ugc()`.

See #48022.

Themes: In `get_theme_mod()`, only run the `sprintf()` replacement on the default value if there's a string format pattern found in the value.

This prevents standalone percent symbols from being stripped out, e.g. in a default value like `100%`.

Props aristath, kuus, moonomo, westonruter, davetgreen, daviedR, katielgc, noisysocks, SergeyBiryukov.
Fixes #34290.

Docs: Improve documentation for `get_theme_mod()` and `set_theme_mod()`.

See #47110.

Emoji: Stop emoji replacement from happening inside CodeMirror instances, and clean up some logic in the `MutationObserver`.

Props pento, hirofumi2012, davidbaumwald.
Fixes #46537.

Themes: Bring default values for `get_theme_root()`, `get_theme_root_uri()`, `wp_get_theme()`, and `wp_customize_url()` in line with the documentation.

Reverts [46327].

Fixes #44397.

Docs: Add missing description for `$comment` global.

Props immeet94, mukesh27.
Fixes #46928. See #47110.

I18N: Add missing comma in a translator comment.

See #47515.

Customize: Prevent breaking the customizer when site title contains templating syntax.

When the site title is inside an underscore template, syntax defined in `wp.template` like `{{ }}` is treated as special characters and will make Underscore treat it as data to be compiled/rendered.

Props pierlo, donmhico.
Fixes #46863.

QUnit: Include script dependencies for wp-a11y script to fix a TypeError.

Also, add missing message argument to Customizer notifications to ensure tests are passing.

Fixes #45066.

I18N: Fix translator comment for a themes list table string with numbered placeholders.

Props garrett-eclipse.
Fixes #47515.

Docs: Convert 'Block Editor' to lowercase.

Props garrett-eclipse.
Fixes #45634.

Networks and Sites: Improve newly added strings for i18n.

* Remove unnecessary numbered placeholders.
* Add context to "All" and "Spam" status.
* Add translator comments.

Props pedromendonca.
Fixes #48210.

Networks and Sites: Fix issues processing additional fields displayed for the Sites list table.

This prevents a `The link you followed has expired.` error when using a filter and now uses `$_POST` instead of `$_GET` to capture all form values.

Props pbiron.
Fixes #45954.

Docs: Clarify default value for the `$link` parameter in `edit_tag_link()`, `edit_term_link()`, and `edit_bookmark_link()`.

Props atachibana.
Fixes #48109.

Upload: Fix the method used to create image sub-sizes when uploading fails with a PHP fatal error. Use a custom header to send the new attachment post ID even in HTTP 500 responses instead of an upload reference sent by the client. Also add another cap check and remove the action when deleting an attachment post during a failed upload cleanup.

Props timothyblynjacobs, clorith, azaozz.
Fixes #48200.

Docs: Fix code example for removing internal pointers.

Props daleharrison, swissspidy, garrett-eclipse, luciano-croce, jrf, desrosj.
Fixes #45529.

Menus: Fix typo in the class attribute for the hidden `title` field in `Walker_Nav_Menu_Checklist`.

Each item that `Walker_Nav_Menu_Checklist` displays is accompanied by several hidden `<input/>` fields that specify default values for each item when added to a menu. These values are passed in JavaScript to the AJAX call triggered when an item is added to a menu.

The hidden field for the title attribute field incorrectly had an underscore instead of a hyphen. Because of this, it was impossible to supply a default value for the Title Attribute field of a nav menu item.

Props yanngarcia, davidbaumwald.
See #47838.

Media: Ensure `medialement` scripts are loaded in the footer.

This fixes a regression in [41877] which caused `mediaelement` scripts to load in the header.

Props Themezly.
Fixes #44484.

General: Patch PHMailer for PHP 7.4 compatibility.

This patches the PHPMailer library in Core to be PHP 7.4 compatible by adding a version check before calling `get_magic_quotes_runtime()`.

Props ayeshrajans, jrf.
See #47783.

Docs: Add missing `@deprecated` tags.

Follow up to [46205-46206,46208].

Props jrf.
See #47699.

Media: Improve documentation for `add_image_size()`

This improves the description of the `$crop` parameter to clarify behavior.

Props nikolastoqnow, ketuchetan, audrasjb, killua99, pierlo.
Fixes #42463.

Accessibility: Media: Add more headings in the Media Modal.

Headings are the predominant mechanism for screen reader users to find information in a page. They also help all users to better identify the main sections of user interfaces.

- adds three new headings within the media modal 
- improves plural form translation for "item selected" by using `wp.i18n`
- horizontally centers the media modal menu in the responsive view

Props kjellr, karmatosed, melchoyce, afercia.
See #47149.
Fixes #47610.

Privacy: Remove unused `$wpdb` global in `WP_Privacy_Requests_Table::prepare_items()`.

Props david.binda.
Fixes #48178.

Accessibility: Media: Allow users to set a proper language for Video subtitles.

For a number of years, subtitles track added to videos were always set to "English" regardless of the actual subtitles language.

By making the track `srclang`, `label`, and `kind` attributes editable, content authors are now able to set a language that matches the actual track content.

Props BjornW, audrasjb, birgire, karmatosed, sabernhardt, afercia.
Fixes #47559.

Login and Registration: Hide the Edge browser "Reveal password" native button.

Props Clorith.
Fixes #42888.

Accessibility: Improve and modernize user interface controls for better contrast: Login screen improvements.

- allows the login input fields to better scale with text 
- improves the input fields layout on Internet Explorer 11
- uses the new focus style on the "Show password" button 
- adjusts the CSS for the interim login

See #47153.
See #42888.

Shortcodes: Improve handling from `shortcode_parse_attts()`.

Added missing @ticket for #47863 on `data_shortcode_parse_atts()`

Also cleans up some linter fixes that were missed.

Props garrett-eclipse, whyisjake.
ixes #47863.

Shortcodes: Improve handling from `shortcode_parse_attts()`.

Ensure consistency between `shortcode_parse_attts()` when being used directly.

Props mauteri, birgire, SergeyBiryukov, kadamwhite, whyisjake.
Fixes #47863.

Docs: Fix typo in `wp_get_missing_image_subsizes()` DocBlock.

Props david.binda.
Fixes #48179.

Docs: Remove obsolete comment in `wpmu_signup_blog_notification()` and `wpmu_signup_user_notification()`.

Props david.binda.
Fixes #48185.

Post WordPress 5.3 Beta 2 version bump.

WordPress 5.3 Beta 2.

Block Editor: Update WordPress packages to include the latest bug fixes.

Updated packages:

@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/library-e[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected] 

Props epiqueras, youknowriad, donmhico, jorgefilipecosta, soean, mcsf, noisysocks, andraganescu, gziolo, talldanwp, iseulde, nrqsnchz, mapk, karmatosed, joen, afercia, kjellr, desrosj.
Fixes #48186.

Accessibility: Media: Use the ARIA tabs pattern for the media modal menus.

The ARIA tabs pattern improves interaction for keyboard and assistive technologies users.
It gives the menu items proper roles, and `aria-selected` allows users of assistive technologies to know which tab is currently selected.

Props audrasjb, afercia, joedolson, karmatosed, melchoyce.
See #47149.

Media: Fix the media modal "Insert from URL" field height after [46356].

See #47477.

Site Health: Revert [46323-46325] for further discussion of how the admin email verification should be filtered.

See #48153.

Accessibility: Improve and modernize user interface controls: Improve new styles for the color picker.

Props audrasjb, garrett-eclipse.
Fixes #48131.

Media: Prevents clipping of text when scaling image edit screen.

This reapplies [46354] clean as the previous commit had remnants of an unrelated patch.

Props sabernhardt, audrasjb, afercia.
See #47115.

Site Health: Improve the message displayed to sites not utilizing HTTPS.

The new message better illustrates that there are many potential benefits of using HTTPS, not just a few.

Props garrett-eclipse, dkarfa, ocean90, afragen, desrosj.
Fixes #48118.

Bundled Themes: Update Twenty Twenty.

This brings `trunk`’s version of Twenty Twenty in-sync with GitHub.

For a complete list of changes since [46271], see https://github.com/WordPress/twentytwenty/compare/932b16248...dd7032f

Props anlino, ianbelanger, nielslange, acosmin, netweb, williampatton, adhitya03, phpdocs, acalfieri, itowhid06, littlebigthing, aristath, karmatosed, poena.
See #48110.

Accessibility: Improve and modernize user interface controls: Improve the new form controls styles and heights.

Improves cross-browsers rendering and addresses most of the reported edge cases.

See #47477.

Media: Revert [46354] preventing bad clipping of text in image details page.

See #47115.

Media: Prevents clipping of text when scaling image edit screen.

Props sabernhardt, audrasjb, afercia.
See #47115.

Media: Move `wp_get_original_image_path()` to `wp-content/post.php` to make it easier to access from plugins.

Props pbiron.
See #47873.

Built/Test Tools: Ignore the `node_modules` folder in Twenty Twenty.

Ignore the `node_modules` folder in Twenty Twenty in SVN, and when running `grunt build` or `grunt jshint:themes`.

See #48110.

Docs: Correct `WP_Styles_Registry` documentation.

This change updates the file’s docblock to correctly indicate `WordPress`/`Blocks` as the `@package`/`@subpackage`, updates the `_doing_it_wrong()` versions to `5.3.0` instead of the Gutenberg plugin versions, and removes some stray `gutenberg` text domains.

Props david.binda.
Fixes #48181.

Accessibility: Improve and modernize user interface controls: Remove the CSS transform 1 pixel shift from the buttons active state.

Props Joen.
See #34904.

Comments: Add `rel="nofollow ugc"` attribute to links in comments.

UGC stands for User Generated Content, and the `ugc` attribute value is recommended for links within user generated content, such as comments and forum posts.

See https://webmasters.googleblog.com/2019/09/evolving-nofollow-new-ways-to-identify.html.

Props audrasjb, joostdevalk, dkarfa, SergeyBiryukov.
Fixes #48022.

Upgrade/Install: Fix the Install Now button in the plugin overlay when running WordPress on a specific port.

Props garrett-eclipse, pierlo, afragen.
Fixes #48077.

Twenty Nineteen: Remove trailing comma after selector in `sass/site/primary/_posts-and-pages.scss`.

Props itowhid06.
Fixes #48171.

REST API: Combine `array` and `object` cases in `WP_REST_Meta_Fields::get_default_for_type()` to remove duplicated line.

Add missing description for `$type` parameter.

Props itowhid06, dkarfa.
Fixes #48169.

Accessibility: Improve and modernize user interface controls: Improve the radio buttons blue dot alignment.

Props desrosj, garrett-eclipse, afercia.
See #47498.

Accessibility: Improve and modernize user interface controls: Make the secondary buttons border blue.

Props drw158, youknowriad, kjellr, melchoyce, talldanwp, audrasjb.
See #34904.

Coding Standards: Remove inline assignments and extra whitespace in `tests/multisite/network.php`.

Props garrett-eclipse, jrf.
See #48142.

Docs: Improve comments in `tests/multisite/network.php` per the documentation standards.

Props garrett-eclipse, jrf.
See #48142.

Docs: Improve documentation for `::display()` methods in various list tables.

Props itowhid06.
Fixes #47947.

Accessibility: After [46337]: make the select elements background white also on hover, active, and focus states.

See #47477.
See #48128.

Accessibility: Improve and modernize user interface controls. Style the select elements disabled state.

Props adhitya03, MarcosAlexandre, kjellr.
See #47477.
Fixes #48129.

Fix the context (right-click) menu when clicking the placeholder for the post title field on the classic Edit Post screen.

Props masummdar, audrasjb, afercia.
Fixes #47318.

Accessibility: Improve and modernize user interface controls. Make the select elements background white.

Props adhitya03.
See #47477.
Fixes #48128.

Docs: Add documentation for `WP_Comments_List_Table::display()`.

Props itowhid06, dinhtungdu.
Fixes #47929.

Comments: Avoid PHP notice in `get_comment_reply_link()` for `null` comment.

If there is no global comment, or the input comment is null, return early to prevent warnings.

Fixes #41846
Props birgire, earnjam

Login and Registration: Revert divs and restore paragraphs after [46256].

Fixes #42888.

Options: `register_uninstall_hook()` causes large amounts of unnecessary option updates.

Prevent extra database read/writes from the the hook.

Props jeichorn, MikeHansenMe, DrewAPicture, Rahe, tha_sun, mikeschroder.
Fixes #31792.

Administration: Ensure visual consistency with large titles in the sidebar.

Custom posts, and other menu titles that are long aren't wrapping correctly.

Props jagirbaheshwp, munyagu, harshbarach, hareesh-pillai, pratikkry, naveenkharwar, mukesh27, dushanthi, worldweb, audrasjb
Fixes #42201

Media: Restore the original Image Editor columns layout after [46326].

Fixes #47116.

Menus: Replace http with https in placeholders.

Encourage the use of https with the placeholder text in menus.

Fixes #46312
Props aksl95, audrasjb, celloexpressions, SergeyBiryukov, jorbin.

Tests: Correct `::assertArrayHasKey()` capitalization in [46252].

Props dkarfa, david.binda.
Fixes #48155.

Themes: Add a test to ensure `get_template_part()` does not return a value.

This function must not be modified to return anything due to existing themes which output the return value, for example via `echo get_template_part( ... )`.

See #40969

Themes: Docblock cleanup for `get_theme_root_uri()`

In the function docblock of `get_theme_root_uri()`, the argument types of `$stylesheet_or_template` and `$theme_root` do not match. Default values of arguments are boolean but in function doc they are stated as strings.

Props subrataemfluence, williampatton, garrett-eclipse.
Fixes #44397.

Accessibility: Media: Make the Image Editor buttons text visible.

User interface controls that use only icons aren't ideal for many users. 

Universal icons are rare. Icons must communicate meaning but their actual meaning varies depending on many factors including the users cultural background.
Moreover, users with cognitive impairments and speech recognition users need interface controls with visible text to be able to operate them.

- shortens some of the buttons text to: Rotate left, Rotate right, Flip vertical, Flip horizontal
- moves the Undo and Redo buttons underneath the main buttons group

Props nrqsnchz, melchoyce, karmatosed, sabernhardt, mikeschroder.
Fixes #47116.

Docs: Correct typos introduced in [46324]

Props TimothyBlynJacobs.
See #48153.

Site Health: Consolidate documentation for the `admin_email_check_interval` filter.

See #48153.

Site Health: Allow the capability required for the site admin email verification screen to be filtered.

Props desrosj, Clorith.
Fixes #48153.

Code Modernisation: Introduce the spread operator in `do_action()`.

Rather than relying on `func_get_args()` to retrieve arbitrary function arguments, we can now use the spread operator to assign them directly to a variable.

Props jrf.
See #47678.

Media: Fix JavaScript TypeError after [45376].

Props desrosj, afercia.
Fixes #48021.

Build Tools: Pass the current uid/gid to Docker containers.

This prepares for an upcoming change to the Docker images, which improves file permission handling.

See #47767.

Login and Registration: Standardize on `6 * MONTH_IN_SECONDS` over `180 * DAY_IN_SECONDS` for `admin_email_check_interval` filter.

[45788] changed the first instance, but not the second.

Props tmatsuur.
Fixes #48144.

REST API: Use delta comparison for floating date test added in [46279] to avoid race conditions.

See #48113.

Coding Standards: Remove inline assignment in `test_wp_delete_term_should_invalidate_cache()`.

See #48142.

General: Correct strict comparison in `WP_Links_List_Table::column_categories()` introduced in [46313].

`$cat_id` is a string, `$category` is an integer.

See #48142.

Docs: Improve documentation for `_post_states()` and `get_post_states()`.

Add documentation for `_media_states()`.

See #47110.

General: Further phpcs cleanup.

In [46312] and [46313] we attempted to do some phpcs cleanup. This commit cleans up three issues that were introduced in [46309].

Fixes #48142.

Props: whyisjake, garrett-eclipse, desrosj

General: Further phpcs cleanup.

In [46312] we attempted to do some `phpcs` cleanup. This commit cleans up three issues that were introduced in [46309].

Fixes #48142.
Props whyisjake, garrett-eclipse.

General: Linter cleanup

`phpcbf` was able to clean up a few files. Tests were breaking as a result of code formatting.

Fixes #48142
Props whyisjake

Docs: Fix typo in `wp_print_scripts()`' reference to `WP_Scripts::do_item()`.

Fixes #48141.

Themes: Fix javascript regression that linter found.

Tests were failing from line length optimizations and double quotes. 

Fixes #37536

Menus: Duplicate Page Entry in View All Pages when generating a Menu

Simplifies the interface in menu creation.

Fixes [37782]
Props garrett-eclipse, mdgl, birgire, xkon, audrasjb, pento, girlieworks

Themes: Improve Twenty Fifteen sticky sidebar logic

The current logic in TwentyFifteen (#30366) for making the sidebar sticky while still allowing to scroll through it when the sidebar height is larger than the viewport height is flawed and massively overcomplicated.
This can be mitigated by removing the admin bar specific logic and leaving most of the heavy lifting up to the browser.

Fixes #37536

Props DvanKooten, lukecavanagh, karmatosed, ianbelanger, davidbaumwald

Build/Test Tools: Remove stray `+` introduced in [45979].

Props david.binda.
Fixes #48127.

Accessibility: Implement the new focus styles on the login screen after [46247].

Props @kjellr.
See #47153.

Pings/Trackbacks: Use correct variable in a `foreach()` loop in `do_all_pings()`.

Props itowhid06.
Fixes #48094. See #36824.

Build/Test Tools: Move Composer script command line directives to the PHPCS ruleset.

Also, move all arguments up to the top of the custom ruleset to make it easier to understand the conditions the ruleset is run under.

Props desrosj, jrf.
See #46152.

Build/Test Tools: Introduce automated PHP compatibility checking.

This change introduces a new Composer script, `compat` that will scan the codebase for (detectable) potential PHP compatibility issues using the `PHP_CodeSniffer` and a custom ruleset based off of the `PHPCompayibilityWP` ruleset (`phpcompat.xml.dist`).

The command will be run as a separate job within each Travis build. While many compatibility issues and false positives have already been corrected in this commit and other Trac tickets, there are still some remaining. For that reason, the job is allowed to fail while the remainder of the potential compatibility issues are investigated and addressed. After those are resolved, the job should be set as required to pass to help prevent new compatibility issues from being introduced.

Props desrosj, jrf, all PHPCompatibilityWP and PHPCompatibility contributors.
Fixes #46152.

Block Editor: Align the version of React with the one used in Gutenberg plugin

Gutenberg 6.5 works with react and react-dom set to v16.9.0. This change aligns both.

Props youknowriad.
Fixes #48121.

Docs: Improve consistency in `@since` tags for parameters that were made optional.

See #47110.

Script Loader: Add `function_exists()` checks for `is_admin()` and `current_theme_supports()`, to accomodate for using `WP_Dependencies` as a standalone class.

Remove `<![CDATA[` when outputting HTML5 script tags. 

Props azaozz.
Fixes #42804.

Post WordPress 5.3 Beta 1 version bump.

WordPress 5.3 Beta 1.

Coding Standards: Fix WPCS issue in [46283].

See #48110.

Twenty Twenty: Rename widget areas to `sidebar-1` and `sidebar-2`.

This ensures that widgets are mapped correctly and is consistent with the previous default themes.

See https://github.com/WordPress/twentytwenty/issues/481.

Reverts [46282].

Props ocean90, garrett-eclipse, desrosj, SergeyBiryukov.
See #48110.

Tests: Correct sidebar names for Twenty Twenty.

See #48110.

Site Health: Move "The folder ... was detected as being under version control" message from failure to warning.

Props afragen, davidbaumwald.
Fixes #47982.

REST API: Use delta comparison for floating date tests added in [46252] to avoid race conditions.

See #39953.

Posts, Post Types: Build list of "date floating" post stati dynamically when inserting post.

Completes work begun in #39953 to expose "date floating" status information to frontend clients via the REST API.

Props TimothyBlynJacobs.
Fixes #48113.

Bundled Themes: Make Twenty Twenty the new default theme.

After being imported in [46271], Twenty Twenty can now be set as the default theme in WordPress.

See #48110.
Props desrosj, ocean90.

Bundled Themes: Fix failing tests for Twenty Twenty.

Follow up of [46271].

See #48110.

Site Health: Use `WP_Automatic_Updater::is_disabled()` to check whether automatic updates are disabled.

The previous check for `DISALLOW_FILE_MODS` and `AUTOMATIC_UPDATER_DISABLED` constants didn't always provide accurate results.

Props Clorith, kraftner, afragen.
Fixes #47869.

Coding Standards: Fix WPCS issue in [46274].

See #39953.

REST API: Mark "pending" status as date_floating.

See: https://github.com/WordPress/gutenberg/issues/13176

Props TimothyBlynJacobs.
Fixes #39953.

Site Health: Include simple debug data in fatal error protection email.

Introduce `recovery_email_debug_info` filter for the debug information included in the email.

Props Clorith, TimothyBlynJacobs.
Fixes #48090.

REST API: Introduce WP_Post_Type::get_rest_controller() caching method to prevent unnecessary REST controller construction.

Cache REST controller references on their associated post type object to prevent unnecessary controller re-instantiation, which previously caused "rest_prepare_{$post_type}" and "rest_{$post_type}_query" to run twice per request.

Props TimothyBlynJacobs, patrelentlesstechnologycom.
Fixes #45677.

Bundled Themes: Import Twenty Twenty, the new default theme for WordPress 5.3.

Welcome to the bundled themes family!

Theme development to this point has taken place on GitHub. See: https://github.com/WordPress/twentytwenty/.

Props anlino, ianbelanger, audrasjb, nielslange, fabiankaegy, mukesh27, poena, joyously, emiluzelac, williampatton, dingo-d, dkarfa, acosmin, rabmalin, kafleg, jeffpaul, hareesh-pillai, burhandodhy, afercia, juanfra, soean, presskopp, justinahinon, jrf, netweb, garyj, pento, flixos90, vbaimas, zebulan, byalextran, mor10, kjellr, allancole, tdh, karmatosed, mapk, matt, andrewtaylor-1, ismailelkorchi, garrett-eclipse, gsayed786, dianeco, celloexpressions, aristath, nadir, cbravobernal, intimez, hometowntrailers, collet, littlebigthing, tobifjellner, kevinkovadia, jarretc.
See #48110.

Themes: After [46164], make sure `$type_attr` is always defined in `_custom_background_cb()`.

Props davidbaumwald.
Fixes #48112.

Site Health: Introduce `site_status_test_result` filter for the output of a finished Site Health test.

Props Clorith.
Fixes #47864.

Site Health: Update PHP extension tests to reflect the current state of the Hosting Teams handbook recommendations.

Props Clorith, bronsonquick, jrf, johnbillion, galbaras, mikeschroder, jorbin.
Fixes #47454.

Site Health: Improve wording for PHP update warning.

Props danieltj, garrett-eclipse, marybaum, afragen, chetan200891.
Fixes #47644.

Coding Standards: Fix WPCS issue in [46262].

See #47952.

Privacy: Introduce `wp_privacy_personal_data_email_to` and `wp_privacy_personal_data_email_subject` filters.

Pass email data to the `wp_privacy_personal_data_email_content` filter.

Props garrett-eclipse, thakkarhardik, birgire.
Fixes #46303.

Privacy: Show a success message for personal data erasure.

Props garrett-eclipse, allendav, birgire, JoshuaWold, karmatosed, pputzer.
Fixes #44135.

Taxonomy: Redirect to the correct URL after deleting a taxonomy term attached to a post type other than Post.

Props donmhico, mukesh27

Fixes #47858

Build/Test tools: Ensure the `create_and_get()` factory method returns the appropriate WP_Error when creating a term fails.

Fixes: #47952

Coding Standards: Fix a coding standards issue introduced in [46254].

See #37392.

External Libraries: Fix PHP 7.4 compatibility issues in the SimplePie library.

See: https://github.com/simplepie/simplepie/commit/38b504969ed08903cb12718e8270263a8c93080e

Props jrf, stevenkword, jorbin, desrosj.
See #47746.

Fix PHP coding standards after [46251].

External Libraries: Fix PHP 7.4 compatibility issues in the Requests library.

See: https://github.com/rmccue/Requests/compare/v1.7.0...3470169

Props jrf, jorbin, desrosj.
See #47746.

r46253: Use implode instead of join, see #47746

Login and Registration: Add a "Show password" button on the login page.

The ability for users to see the password they're typing improves usability and accessibility of the login users flow.

- brings the login screen in line with the same feature already used in the New User, Edit User, and Reset Password pages
- improves association of labels and input fields by using explicit association with `for` / `id` attributes
- slightly increases the "Remember me" label font size

Props johnbillion, Iceable, audrasjb, joyously, adamsilverstein, boemedia, DrewAPicture, shadyvb, birgire, peterwilsoncc, pento, anevins, davidbaumwald, whyisjake, afercia.
Fixes #42888.

Revert accidental change to package-lock.json in r46253

Multisite/Sites: supplemental commit to r46251.

This commit adds the links to the list-table class itself (that were missed in r46251.)

See #37392. Props pbiron, thomaswm.

Editor: Add Nonce Endpoint

This is a follow up to #47843, implementing a PHP endpoint and inline scripts 
after the editor package updates. The action was originally added in
https://github.com/WordPress/gutenberg/pull/16683.

Fixes #48076.

REST API: Introduce date_floating property on status endpoint response objects.

Expose a date_floating property on all status objects to permit clients (including the block editor) to make correct decisions about date handling for posts of varying status.

Props mnelson4, earnjam, kadamwhite, jnylen0, nerrad, pento.
See #39953.

Multisite/Sites: Add links to filter websites by status.

This commit brings the Network-Admin Sites list page up-to-speed with other similar list-table powered pages, by adding links to filter the results by Site Status.

Includes a single unit test for the newly introduced `wp_count_sites()` multisite function, named to match the `wp_count_` function pattern from other list tables.

Fixes #37392. Props mnelson4, spacedmonkey, pbiron.

Accessibility: Make sortable meta boxes non sortable when there are no locations they can be dragged to.

Depending on the amount of meta boxes and the layout settings under Screen Options, sortable meta boxes may not be actually sortable.
In these cases, jQuery UI sortable needs to be disabled and the user interface shouldn't use a CSS `cursor: move`.

The use of consistent and relevant cursors may be important for users who have a cognitive disability, since cursors give a visual clue as to an element's functionality. Using the move cursor for elements which cannot be moved may be confusing or counter-intuitive for users.

Props adamsilverstein, antpb, anevins.
Fixes #47131.

REST API: Pass "null" as the post date property to reset post to initial "floating" date value.

Props TimothyBlynJacobs, adamsilverstein, jnylen0, mnelson4.
Fixes #44975.

Accessibility: Improve and modernize user interface controls. Sixth part: allow checkboxes and radio buttons to scale with text.

- uses a SVG icon for checkboxes
- uses CSS `rem` relative units

Props kjellr, afercia, audrasjb.
Fixes #47498.

Accessibility: Improve and modernize user interface controls for better contrast. Fifth part: Common form controls.

Props anevins, melchoyce, audrasjb, kjellr.
Fixes #47153.

Docs: Improve documentation for the `supports` argument in `register_post_type()`/`add_post_type_support()`.

Follow up of [46160].

Fixes #40413.

Media: Sets `post_id` optional in `media_sideload_image()` and `media_handle_sideload()`.

Props SergeyBiryukov, donmhico, mikeschroder, sebastian.pisula.
Fixes #43579.

Accessibility: Improve and modernize user interface controls for better contrast. Fourth part: Media Views form controls.

Props anevins, audrasjb, nrqsnchzm, kjellr, karmatosed.
Fixes #47150.

Accessibility: Improve and modernize user interface controls. Third part: allow buttons and form controls to scale with text.

Props kjellr, abrightclearweb, audrasjb.
Fixes #47477.

Accessibility: Improve and modernize user interface controls for better contrast. Second part: tables, meta boxes, and other user interface elements.

Introduces better contrast for borders of the following user interface elements:
- Tables
- Screen Options and Help 
- Admin notices
- Welcome panel
- Meta boxes (post boxes)
- Cards
- Health Check accordions and headings
- Theme and Plugin upload forms

Props kjellr, melchoyce, karmatosed, audrasjb.
Fixes #48101.

Accessibility: Improve and modernize user interface controls for better contrast. First part: buttons and links.

- Introduces new styles for the buttons, with better contrast for borders and better focus style.
- Introduces a new focus style for links.
- The new styles improve consistency with the ones used in the new Block Editor (Gutenberg).

Props michaelarestad, truchot, mor10, kellychoffman, adamsoucie, paaljoachim, Joen, kjellr, melchoyce, karmatosed, audrasjb, afercia.
Fixes #34904.

Accessibility: Menus: Improve the menu items "Select All".

- changes "Select All" from a link to a checkbox
- the new checkbox is available only when JavaScript support is on
- semantically and for accessibility, a checkbox is a better user interface control because the available action is clear to all users and the selected state is communicated natively
- it's consistent with the existing pattern for the admin tables

Props birgire, audrasjb, afercia.
Fixes #47048.

Accessibility: Media: Make screen readers announce the Media search results.

- adds audible messages via `wp.a11y.speak()` to announce the search results 
- removes a `keyup` event that was there only to support old browsers 
- removes `aria-modal="true"` from the media modal dialog as it prevents the ARIA live regions to be perceived by screen readers
- triggers the search only after 2 ASCII characters have been typed

Props anevins, antpb, aduth, loreleiaurora, afercia.
Fixes #47146.

Media: Prevent unnecessary whitespace around PDF Thumbnails.

Stops unintended whitespace from showing around PDF thumbnails
when the PDF creation tool utilized a CropBox.

Props michelweimerskirch, joemcgill.
Fixes #45598.

Media: Fix buttons group layout for Internet Explorer 11 after [45499].

Props sabernhardt, afercia.
See #47122.
Fixes #48087.

Accessibility: Make sure the navigation ARIA landmarks used for posts and comments navigation are properly labelled.

The `<nav>` element defines an ARIA landmark by default: landmarks help assistive technology users to perceive the page main sections and jump through them. However, when a landmark is used more than once in a page, it needs to be distinguished from the other ones to let users understand what the landmark is about.

Adds an `aria-label` parameter to the following functions: 

- `_navigation_markup()`
- `get_the_post_navigatio()`
- `get_the_posts_navigation()`
- `get_the_posts_pagination()`
- `get_the_comments_navigation()`
- `get_the_comments_pagination()`

Props sabernhardt, williampatton, SergeyBiryukov, audrasjb.
Fixes #47123.

KSES: Add support for modern layout techniques in `style` attribute.

Adds support for `flex`, `grid` and `column` layout techniques to the list of CSS attributes considered safe for inline CSS. The `\` character and CSS functions, eg `minmax()` are not yet supported.

Extends support of `border` properties to include `border-radius` and individual `background` properties to include all those implicitly supported by the shorthand attribute.

Props mrahmadawais, marybaum, birgire, peterwilsoncc, azaozz.
Fixes #37248.
See #47367.

Accessibility: Twenty Nineteen: Improve the special pages headings.

Improves information provided by the headings, their alignment and spacing in the following special pages:
- search page with and without search results
- 404 page (no content)
- archive pages

Props ianbelanger, kjellr, nrqsnchz, audrasjb.
Fixes #47140.

REST API: Consistently default URL scheme to "rest", not "json".

The "json" scheme is a holdover from the pre-merge plugin version of the REST API, and was corrected elsewhere in core in [34300]. Only "rest" is officially supported in `set_url_scheme()`.

Props DrewAPicture, rmccue.
Fixes #45169.

Docs: Docblock corrections and improvements, mostly related to various `pre_*` filters.

See #47110

Site Health: Don't verify SSL certificate when testing the local site.

The SSL certificate may be self-signed which prevents various tests from returning proper results. Since the Cron API and file editors don't verify the certificate the tests shouldn't either.

Props Clorith, ocean90.
Fixes #47957.

File Editor: Don't verify SSL certificate when doing loopback requests for checking for fatal errors.

Props Clorith.
See #47957.

I18N: Remove HTML tags from translatable string in `wp-login.php`.

See #46349.

Site Health: Replace `wp_get_upload_dir()` with `wp_upload_dir()`.

`wp_get_upload_dir()` returns the theoretical path of the uploads directory. When there was no upload yet the test returns an incorrect result (not writeable) because the directory doesn't exist. Switching to `wp_upload_dir()`, which creates the directory on the fly, ensures a proper test result.

Fixes #47958.

Coding Standards: Add missing `break` for the default case in `get_default_comment_status(()`.

Props itowhid06.
Fixes #48095.

Docs: Correct type for the `$data` parameter of `WP_Theme::cache_add()`.

Props itowhid06.
Fixes #48096.

Code Modernization: Use the `**` operator instead of the `pow()` function in `wp_convert_bytes_to_hr()` for better performance.

Use the `MB_IN_BYTES` constant instead of the `pow()` function in `WP_Customize_Manager::_validate_header_video()` for better readability.

Props ayeshrajans, jrf.
Fixes #48083.

Tests: Correct assertion in `test_wp_validate_boolean()` to make sure the return type is properly tested.

Props jrf.
Fixes #39868.

Docs: Improve the docs for comment counting related functions.

See #47110, #48093

Tests: Remove a workaround for `str_getcsv()`.

The `str_getcsv()` function was introduced in PHP 5.3.0, so no longer needs a polyfill.

Props jrf.
Fixes #48074.

Tests: Remove a workaround for `get_called_class()`.

The `get_called_class()` function was introduced in PHP 5.3, so no longer needs a workaround.

Mark `WP_UnitTestCase_Base::get_called_class()` as deprecated. Leave it in place for now as plugins or themes using the WP unit test framework might still call this method.

Props jrf.
See #48074.

Code Modernization: Remove workarounds for `spl_object_hash()`.

The `spl_object_hash()` function was introduced in PHP 5.2.0. As of PHP 5.3, the PHP SPL extension can no longer be disabled, so these workarounds are no longer needed.

Props jrf.
See #48074.

Tests: Remove a test for `rest_preload_api_request()` only relevant for PHP 5.2.

Props dkarfa.
See #48074.

Code Modernization: Remove a workaround for `CURLOPT_PROTOCOLS` in `WP_Http_Curl::request()`.

The `CURLOPT_PROTOCOLS` constant was introduced in PHP 5.2.10, so no longer needs a workaround.

Props jrf.
See #48074.

Code Modernization: Remove a workaround for `IMAGETYPE_ICO` in `file_is_displayable_image()`.

The `IMAGETYPE_ICO` constant was introduced in PHP 5.3, so no longer needs a workaround.

Props jrf.
See #48074.

Code Modernization: Remove a workaround for HHVM in `WP_Image_Editor_Imagick::test()`.

Support for HHVM was dropped in 2017 via #40548.

Props jrf.
See #48074.

Docs: Update a comment about `pcre.backtrack_limit` upper limit in `benchmark_pcre_backtracking()`.

See #48074.

Code Modernization: Remove all code using a `version_compare()` with a PHP version older than PHP 5.6.

Props jrf.
Fixes #48074.

Tests: Replace "blog" reference in a comment about `DISABLE_WP_CRON` usage with "site".

Props davidbaumwald.
Fixes #48089.

Docs: Add missing `$which` parameter descriptions.

Follow up of [46211].

See #45954.

Networks and Sites: Add support for the `extra_tablenav()` method in `WP_MS_Sites_List_Table`.

This method allows additional filters or other UI components to be added to the top and bottom of the `WP_List_Table` between the bulk actions dropdown and search input field.

Fixes #45954.
Props pbiron, desrosj.

Code Modernization: Remove conditional use of PHP `realpath()`.

The `realpath()` function was introduced in PHP 4.0.0. There's no point in checking if the function exists in PHP 5.6+, in only 2 instances out of 29.

Props jrf.
Fixes #48075.

Privacy: Display group items count in the personal data export file if there's more than one item in the group.

Props birgire, garrett-eclipse, pputzer.
Fixes #46895.

Code Modernization: Remove JSON related polyfills.

The PHP native JSON extension has been bundled and compiled with PHP by default since version 5.2.0. Because the minimum version of PHP required by WordPress is now 5.6.20 (see #46594 and [45058]), JSON extension related polyfills and backwards compatibility code can now be removed.

This change removes the `json_last_error_msg()` and `JsonSerializable` polyfills included in WordPress for full JSON extension support in PHP < 5.6.

Follow up of [46205-46206].

See #47699.
Props jrf, Clorith, pento.

Media: make search input full width on mobile. Take two.

Props m1tk00.
Fixes #40130.

Code Modernization: Remove JSON extension workarounds for PHP < 5.6.

The PHP native JSON extension has been bundled and compiled with PHP by default since version 5.2.0. Because the minimum version of PHP required by WordPress is now 5.6.20 (see #46594 and [45058]), JSON extension related polyfills and backwards compatibility code can now be removed.

This change removes code that supported JSON related functionality on older versions of PHP. This includes (but is not limited to) checks that `json_last_error()` exists, checking and setting the `JSON_UNESCAPED_SLASHES` and `JSON_PRETTY_PRINT` constants if not previously defined, and deprecating the `_wp_json_prepare_data()` function (which was 100% workaround code).

Follow up of [46205].

See #47699.
Props jrf, Clorith, pento.

Code Modernization: Deprecate the `Services_JSON` and `Services_JSON_Error` classes.

The PHP native JSON extension has been bundled and compiled with PHP by default since version 5.2.0. Because the minimum version of PHP required by WordPress is now 5.6.20 (see #46594 and [45058]), JSON extension related polyfills and backwards compatibility code can now be removed.

Since there are still some plugins and themes that utilize the `Services_JSON` class, these classes will remain for the time being, but including the `wp-includes/class-json.php` file and creating `Services_JSON` instances will now throw deprecated notices.

See #47699.
Props jrf, Clorith, pento.

Remove left-over debug code after [46203].

See #46349.

Admin email verification:

- Fix wording of the HTML title.
- Add hidden `(opens in a new tab)` to links that need it.
- Add the `screen-reader-text` CSS class to login.css.
- Add another translator comment.

Props afercia.
See #46349.

Media/Upload: rotate images on upload according to EXIF Orientation.

Props msaggiorato, wpdavis, markoheijnen, dhuyvetter, msaggiorato, n7studios, triplejumper12, pbiron, mikeschroder, joemcgill, azaozz.

Fixes #14459.

Docs: Correct `@since` tag for `comments_popup` public query variable removed in [35848].

Props hareesh-pillai.
Fixes #48080.

Build/Test Tools: Specify PHP 5.6 as the required version of PHP in Composer.

Props ayeshrajans, jrf, netweb.
Fixes #48081.

Site Health: Use sentence casing consistently in header tags.

Props SergeyBiryukov, ajayghaghretiya1, ronakganatra, mukesh27, Clorith.
Fixes #47298.

Docs: Add `@since` tag for the new `$position` argument added to `add_submenu_page()` and related functions in [46197].

See #39776.

Menus: add a position argument to `add_submenu_page` and the helper functions that use it.

Add a position argument to the `add_submenu_page` function similar to the one already in `add_menu_page`. When adding sub menus enables setting the position in the sub menu where the item should appear.

In addition, add the position argument to functions that call `add_submenu_page` under the hood: `add_management_page`, `add_options_page`, `add_theme_page`, `add_plugins_page`, `add_users_page`, `add_dashboard_page`, `add_posts_page`, `add_media_page`, `add_links_page`, `add_pages_page` and `add_comments_page`.

Props welcher, birgire, alexvorn2.
Fixes #39776.

Docs: Clarify that `$show_in_rest` parameter of `register_post_type()` and `register_taxonomy()` should be enabled for the post type or taxonomy to be available in the block editor.

Props ramon-fincken.
Fixes #48084.

Accessibility: Bundled Theme: Make the TwentyEleven skip link the first focusable element within the body.

Props poena, williampatton.
Fixes #47891.

Multisite: Remove the redundant `blog_versions` table.

As part of the Multisite installation process, a `blog_versions` table is created. This table is never read from (except immediately prior to updating it), it's only ever inserted into or updated. It is not used to determine which blogs need to be upgraded.
This table was introduced in 3.0 when the WPMU schema was merged #11644 and it appears the table has never been used in core and is therefore redundant and may as well be removed.

Props johnbillion, nacin, ryan, johnjamesjacoby, whyisjake.

Fixes #19755. See #41685.

Networks and Sites: Save database version in site meta (Multisite)

Currently there is there a table in multisite called blog_versions. All this table stores is the database version as number and the date updated. With plans to add site meta in #37923 this new table should be used. This has a number of benefits, including functions to CRUD these values in the database. Once this data is in the blogmeta, table, the blog_versions table can be removed all together. If require a SQL view can be used blog_versions from data stored in blogmeta.

Props spacedmonkey, leogermani.

Fixes #41685. See #19755.

Login and Registration: Detect JavaScript on the login screen.

This allows the login screen to be targeted with CSS when JavaScript is disabled.

Props Nikschavan.
Fixes #38088.

REST API: Revert [45687].

This change may not be needed and further investigation is required before we accept it into a release.

See #46907.

Block Editor: Fixes failing unit tests related to Social Link blocks

Follow-up for #47843 - update the WordPress Packages to the ones used in the Gutenberg 6.5 release.

Props desrosj.

Fixes #47843.

Block Editor: Update the WordPress Packages to the ones used in the Gutenberg 6.5 release

Updated Packages:

In version 6.2:

@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]

In version 6.4:
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]

In version 6.5:
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]0
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]
@wordpress/[email protected]

Props youknowriad desrosj noisysocks pento jorgefilipecosta iseulde

Fixes: #47843

Query: Expand the list of operators available to `compare_key` in `WP_Meta_Query`.

`compare_key`, introduced in #42409, previously supported only `=` and `LIKE`
operators. This changeset introduces a number of other operators: `!=`, `IN`,
`NOT IN`, `NOT LIKE`, `RLIKE`, `REGEXP`, `NOT REGEXP`, `EXISTS`, and `NOT EXISTS`
(the latter two aliased to `=` and `!=`, respectively). To support case-sensitive
regular expression key comparisons, the new `type_key` parameter will force
a MySQL `CAST` when 'BINARY' is passed.

Props soulseekah.
Fixes #43346.

Build/Test Tools: Improvements to Composer scripts.

Prefixing a script command with `@php ` ensures that the script runs with the same version of PHP that Composer is installed with (and not the system default).

This change also updates the `phpcs` and `phpcbf` commands to use the version of PHPCS installed by Composer.

The `—standard` is no longer explicitly passed to the command. By default, PHPCS will look for `phpcs.xml.dist`, which is the name of the custom standards file currently in Core.

Props dingo_d, jrf.
Fixes #47853.

REST API: Issue warning if array meta is registered without item schema.

The purpose of meta registration is to assert that the meta key will contain a predictable value conforming to a schema, so the schema is therefore considered to be required.

Props TimothyBlynJacobs, grapplerulrich.
Fixes #43392.

PHP 7.4: Fix another instance of array access on a datatype that cannot be accessed as an array.

PHP 7.4 adds a warning when trying access a null/bool/int/float/resource (everything but array, string and object) as if it were an array.

Follow up of [45639].

Props desrosj, jrf.
See #47704.

REST API: Support dot.nested hierarchical properties in _fields query parameter.

Enable clients to opt-in to receipt of one or more specific sub-properties within a response, and not other sub-properties.
Skip potentially expensive filtering and processing for post resources which were explicitly not requested.

Props kadamwhite, TimothyBlynJacobs, dlh.
Fixes #42094.

Bootstrap/Load: Reorganize the initialization flow so that the check for PHP and MySQL requirements could run as early as possible.

This allows us to use PHP 5.6+ syntax in more files, and display a proper error message on older PHP versions, instead of causing a parse error.

Fixes #48059.

Tests: Replace `join()` with `implode()` in `do_enclose()` tests introduced in [46175], and ensure the arguments passed are in the correct order.

The `implode()` function accepts two parameters, `$glue` and `$pieces`. For historical reasons, these parameters have been accepted in any order, though it was recommended that the documented order of `$glue, $pieces` be used. It is also generally considered best practice to use the canonical function rather than an alias.

Starting in PHP 7.4, specifying the parameters in the reverse order will trigger a deprecation notice with the plan to remove this tolerance in PHP 8.0.

Props jrf.
Fixes #36824. See #47746.

Docs: Format multi-line comment in [46180] per the documentation standards.

See #45066.

Tests: Update unit tests to account for the removal of old `wp-a11y` from the loaded scripts in [46179].

Props sstoqnov.
See #45066, #48071.

Script Loader: Remove old `wp-a11y` from the loaded scripts after [46167] and [46169].

Props garrett-eclipse, sstoqnov.
See #45066.
Fixes #48071.

Improve performance of trackback query in `do_all_pings()`.

Previously, the direct SQL query used to identify trackbacks in
`do_all_pings()` performed poorly, due to an unindexed query against the
`to_ping` column. We improve performance in two ways. First, we switch
to using a postmeta flag for posts that require trackbacks to be sent;
queries joining against the postmeta table that check only the `meta_key`
are generally quite fast. Second, we switch to the use of `WP_Query`,
making the query cacheable and filterable using standard methods.

Props dshanske, spacedmonkey, janw.oostendorp, mrmadhat, birgire.
Fixes #36824.

Use `WP_Query` when sending pingbacks.

Props dshanske, spacedmonkey, janw.oostendorp, mrmadhat, birgire.
See #36824.

PHPCS: Fix coding standards violations in `do_enclose()`.

* Use strict checking when appropriate in `in_array()` checks.
* Improved comment formatting.
* Yoda and strict equality checks where appropriate.

See #36824.

Improve `do_enclose()` logic on post publish.

Removing the direct SQL query in `do_all_pings()` improves filterability.

As part of this change, the signature of `do_enclose()` is changed so that
a null `$content` parameter can be passed, with the `$content` then inferred
from the `$post` passed in the second parameter. In addition, the second
parameter was modified so that a post ID or a `WP_Post` object can be
provided. These changes make it possible to trigger enclosure checks with
a post ID alone (as in `do_all_pings()`) and also brings the function
signature in line with `do_trackbacks()` and `pingback()`.

Props dshanske, spacedmonkey, janw.oostendorp, mrmadhat, birgire.
See #36824.

Uploads: add helper functions for setting, getting, and deleting the temp upload reference used to the attachment_id when retrying to make image sub-sizes.

See #47872.

TinyMCE: update to version 4.9.6. Changelog: https://github.com/tinymce/tinymce/blob/4.x/changelog.txt. Includes fix for the `Permission denied to access property "nodeType"` error.

Fixes #47437.

Add SMS to the list of allowed protocols.

This commit expands the list of allowed protocols. It adds the `sms://` which can be used to open meessaging clients for mobile users.

Props rilwis, kraftbj

Fixes #39415

Script Loader: Move the `current_theme_supports()` check above the `wp_default_(scripts|styles)` action, for consistency.

See #42804.

Script Loader: Only check current theme's HTML5 support for scripts and styles on front end.

Avoids a fatal error in the admin if `SCRIPT_DEBUG` is disabled.

Props azaozz.
See #42804.

Accesibility: Replace wp-a11y.js with @wordpress/a11y package

Continuation of [46167]. This fixes the tests that ended up broken following the previous commit.

We've extracted wp-includes/wp-a11y.js to a reusable package wordpress/a11y which is published on NPM. Let's make sure this package is also 
used in WordPress core. Once all the JavaScript is built using webpack, we can also import this package wherever it is used and configure 
webpack to load is an external.

Props, garrett-eclipse

Fixes #45066

Media: remove leftover test string change after [45499].

Props imath, audrasjb.
Fixes #48067.

Accessibility: Replace wp-a11y.js with @wordpress/a11y package

We've extracted wp-includes/wp-a11y.js to a reusable package wordpress/a11y which is published on NPM. Let's make sure this package is also used in WordPress core. Once all the JavaScript is built using webpack, we can also import this package wherever it is used and configure webpack to load is an external.

Props omarreiss, herregroen, desrosj, ocean90, afercia, sstoqnov

External Library: Update getid3 to 1.9.18

Follow up to r46112 as getid3 has tagged an official release.

Changes: https://github.com/JamesHeinrich/getID3/compare/00f3fbfd77e583099ca70a3cf0bc092e113d2b20...v1.9.18

Props desrosj, jkitchen.
Fixes #47751 #40883 #43836.

Bundled Themes: Declare HTML5 support for scripts and styles.

Fixes #42804.

Script Loader: Introduce HTML5 support for scripts and styles.

When a theme declares HTML5 support for script and styles via `add_theme_support( 'html5', array( 'script', 'style' ) )`, the `type="text/javascript"` and `type="text/css"` attributes are omitted.

These attributes are unnecessary in HTML5 and cause warnings in the W3C Markup Validation Service.

Props sasiddiqui, swissspidy, knutsp, SergeyBiryukov.
See #42804.

Accessibility: Add `aria-current` to the Archives, Categories, and Recent Posts widgets output.

The `aria-current` attribute is a simple, effective, way to help assistive technology users orientate themselves within a list of items.

Continues the introduction in core of the `aria-current` attribute after [41359] and following changes.

Props audrasjb, melchoyce.
Fixes #47094.

Docs: Improve docs for upload and `wp_die()` related functions.

See #47110

Docs: Add missing descriptions for functions in `wp-admin/update-core.php`.

Also, fix the `@since` annotation added in [45480] to include the correct version.

Props SergeyBiryukov, ajayghaghretiya1.
Fixes #47424.

Posts, Post Types: Allow support arguments to be specified when registering post types.

The `add_post_type_support()` function accepts an optional third parameter that allows extra arguments to be supplied to configure post type support for a given feature. However, because of how `register_post_type()` and `WP_Post_Type->add_supports()` work, it is currently impossible to pass these additional arguments when initially registering a post type with `register_post_type()`.

This change makes it possible to supply additional arguments for a feature using the `supports` argument of `register_post_type()`.

Props MaximeCulea, seuser, desrosj, johnbillion.
Fixes #40413.

Build/Test Tools: Improve test coverage for `wp_validate_boolean()`.

This change also reworks the test class to use a data provider.

Props pbearne, desrosj
Fixes #39868

Build/Test Tools: fix source map loading in Firefox.

Fix an issue that prevented source maps from loading correctly in Firefox developer tools. Matches a fix introduced in Gutenberg build in PR:17024.

Props pierlo, andraganescu.
Fixes #47870.

External Libraries: Update Backbone.js to 1.4.0.

Upgrade Backbone to the latest stable version. Fix some issues in Media with `listenTo` which changed in this version, see https://backbonejs.org/#changelog.

Props desrosj, priyankkpatel, pierlo.
Fixes #47478.

Docs: Correct accepted values for `search_columns` parameter in `WP_User_Query`.

Props meloniq.
Fixes #48057.

General: Ensure the arguments passed to `implode()` are in the correct order.

The `implode()` function accepts two. parameters, `$glue` and `$pieces`. For historical reasons, these parameters have been accepted in any order, though it was recommended that the documented order of `$glue, $pieces` be used.

Starting in PHP 7.4, specifying the parameters in the reverse order will trigger a deprecation notice with the plan to remove this tolerance in PHP 8.0.

This change fixes the occurrences of reversed arguments in Core with the exception of those contained in included external libraries. These will be handled separately.

Props jrf, jorbin.
See #47746.

Date/Time: Introduce `get_post_datetime()` to retrieve post published or modified time as a `DateTimeImmutable` object instance.

Introduce `get_post_timestamp()` to retrieve post published or modified time as a Unix timestamp.

Use `get_post_datetime()` in `get_post_time()` and `get_post_modified_time()` to return correct GMT time if default timezone is changed from UTC.

Props Rarst, johnregan3.
Fixes #25002.

Network Admin: Allow Sites to have filterable States in List Table rows.

This change introduces a new `site_states()` method to the Sites List Table class (with a new `display_site_states` filter inside of it) following the pattern popularized in other List Table classes before it (Posts, Media, etc...)

Fixes #37684. Props mnelson4, pbiron, jeremyfelt, johnjamesjacoby.

Docs: Improve documentation for `get_bookmarks()`.

Props pbiron.
Fixes #48053.

Site Health: Add a link to "Debugging in WordPress" support article to fatal PHP error handler's default message.

Props garrett-eclipse, tobifjellner, dkarfa, hareesh-pillai.
Fixes #47681.