After [40059] the CSS class `button-link` uses `text-align: left` by default.
This change now requires to limit as much as possible the use of `button-link`
to controls that should really look like links and to explicitly set
`text-align: center` in a few other cases.
Fixes#39983.
Built from https://develop.svn.wordpress.org/trunk@40358
git-svn-id: http://core.svn.wordpress.org/trunk@40265 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This extends the existing behavior which only showed a message only when there were no widget areas rendered in the preview. The number of non-rendered widget areas is indicated. Also removes needles deletion of `wp.customize.Widgets.data.l10n` property which hindered plugins.
See #33567, #33052.
Fixes#39087.
Built from https://develop.svn.wordpress.org/trunk@40312
git-svn-id: http://core.svn.wordpress.org/trunk@40219 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Since support for PDF previews were added in [38949], it's possible
that the generated image file could overwrite an existing image file
with the same name. This uses `wp_unique_filename()` to avoid this
issue and adds a '-pdf' identifier on the end of filenames.
Props gitlost, derosj, mikeschroder, joemcgill.
Fixes#39875. See #31050.
Built from https://develop.svn.wordpress.org/trunk@40130
git-svn-id: http://core.svn.wordpress.org/trunk@40067 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add QUnit tests for the parsing of custom namespace routes. Add a custom schema fixture based on the `wp-js-widgets` plugin. Test that the client can parse the widget namespace in the schema and correctly construct the expected group of models and collections. Also includes a small unrelated QUnit fix to ensure nav-menu test passes when it is loaded without its tests executing as well as a small jshint fix, adding a missing semicolon since [40107].
Props jnylen0.
Fixes#39561.
Built from https://develop.svn.wordpress.org/trunk@40109
git-svn-id: http://core.svn.wordpress.org/trunk@40046 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Enable history support for the new theme screen, including navigating theme details and closing the details modal. Theme selection is now also bookmark-able, so linking to a URL like `/wp-admin/theme-install.php?theme=twentyseventeen` correctly opens the theme preview.
Props dd32.
Fixes#36613.
Built from https://develop.svn.wordpress.org/trunk@40107
git-svn-id: http://core.svn.wordpress.org/trunk@40044 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Updates `.button-link` adding color and underline to make link-like buttons look
like links by default. Introduces `.button-link-delete` as a modifier, stackable
CSS class for red button-links.
Props Cheffheid, afercia.
See #34242.
Fixes#35126.
Built from https://develop.svn.wordpress.org/trunk@40052
git-svn-id: http://core.svn.wordpress.org/trunk@39989 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix a JavaScript error when the media edit screen is loaded directly via a url such as `/wp-admin/post.php?post={post_id}&action=edit&image-editor`. Add a check in `imgLoaded` for `this.hold.sizer` which is set up during initialization and required for the cropping tool. Call `init` if this is undefined.
Props NoseGraze.
Fixes#38138.
Built from https://develop.svn.wordpress.org/trunk@40020
git-svn-id: http://core.svn.wordpress.org/trunk@39957 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The checks were introduced in [22256] to prevent user settings to be set for super admins that were not a member of the current site. However the latter should apply to any kind of user, so the `is_super_admin()` check is redundant. Furthermore, removing these checks is necessary for the ongoing effort to get rid of `is_super_admin()` checks in general.
Props chandrapatel for initial patch.
Fixes#39199. See #37616.
Built from https://develop.svn.wordpress.org/trunk@39932
git-svn-id: http://core.svn.wordpress.org/trunk@39869 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fire a `menu-item-added` event after a menu item is added to the DOM. Fire a `menu-removing-item` event before a menu item is removed from the DOM. Enables hooking into and responding to menu changes.
Props welcher, adamsilverstein.
Fixes#31218.
Built from https://develop.svn.wordpress.org/trunk@39928
git-svn-id: http://core.svn.wordpress.org/trunk@39865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
If index lengths change in table definitions, we don't recreate the index - instead, we throw a database error, as `dbDelta()` tries to create a new index with the same name.
It's better to leave the index as is, MySQL doesn't have an efficient process for resizing indices, and dropping/creating is a slow process which we don't want to trigger automatically.
Fixes#34870.
Built from https://develop.svn.wordpress.org/trunk@39921
git-svn-id: http://core.svn.wordpress.org/trunk@39858 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `term_exists()` check is not needed because of existing dupe
checks in `wp_insert_term()`. Furthermore, `term_exists()` conflates
term names and sanitized slugs, so incorrectly marks terms like
'C' and 'C+' as duplicates of one another.
Props garyc40, SergeyBiryukov, kovshenin, MikeHansenMe.
Fixes#16567.
Built from https://develop.svn.wordpress.org/trunk@39637
git-svn-id: http://core.svn.wordpress.org/trunk@39577 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Also fix logic for `focus-control-for-setting` handler to focus on the first control (lowest `priority` value) associated with a given setting instead of the last control encountered when iterating over all controls, as this ensures the first control in a `nav_menu` section is focused rather than the last one.
Props westonruter, sirbrillig.
See #27403.
Fixes#39101.
Built from https://develop.svn.wordpress.org/trunk@39622
git-svn-id: http://core.svn.wordpress.org/trunk@39562 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In [38625], the functionality to search for attachments by filename was added
via the `posts_clauses` filter and the `_filter_query_attachment_filenames()`
function. This moves `_filter_query_attachment_filenames()` from
`wp-admin/includes/post.php` to `wp-includes/post.php` so that it can be
applied in the same manner in the REST API media endpoint.
Props jblz, tyxla.
Fixes#39092.
Built from https://develop.svn.wordpress.org/trunk@39598
git-svn-id: http://core.svn.wordpress.org/trunk@39538 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Site administrators should not be able to remove themselves from a site. This moves the enforcement of this rule from `wp-admin/users.php` to `remove_user_from_blog()` via the `remove_user` capability, which furthermore allows us to get rid of two additional clauses and their `is_super_admin()` checks in `wp-admin/users.php`. A unit test for the new behavior has been added.
Fixes#39063. See #37616.
Built from https://develop.svn.wordpress.org/trunk@39588
git-svn-id: http://core.svn.wordpress.org/trunk@39528 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The super admin on multisite as well as the administrator on non-multisite both have this capability already. For custom post types using different capabilities this change ensures that only users with that capability have permissions.
Fixes#39059. See #37616.
Built from https://develop.svn.wordpress.org/trunk@39539
git-svn-id: http://core.svn.wordpress.org/trunk@39479 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This adds `srcset` and `sizes` to the about page images, including
art direction, via `<picture>` for the lead Twenty Seventeen image.
This also replaces URLs for all images and feature videos to their
CDN locations on s.w.org.
Props helen, pento, joemcgill.
Fixes#38616.
Built from https://develop.svn.wordpress.org/trunk@39514
git-svn-id: http://core.svn.wordpress.org/trunk@39454 1a063a9b-81f0-0310-95a4-ce76da25c4cd
With [38951] the support for custom page templates has been extended to all post
types. By making the visible meta box titles real labels, accessibility improves
for all users and form fields have meaningful labels.
Fixes#38790.
Built from https://develop.svn.wordpress.org/trunk@39247
git-svn-id: http://core.svn.wordpress.org/trunk@39187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This adds a new filter, `fallback_intermediate_image_sizes`, which
can be used to modify the array of image sizes created for previewing
PDFs in the media library and checks for the existence of sizes before
processing any image representations of a PDF.
Fixes#38594.
Built from https://develop.svn.wordpress.org/trunk@39246
git-svn-id: http://core.svn.wordpress.org/trunk@39186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Adds translation context for "Hide Controls" strings so translators can supply shorter strings where space is constrained. Adds styles to fade-out long the "Hide Controls" label where it would run into the device preview buttons.
Props westonruter, ocean90.
Fixes#38762.
Built from https://develop.svn.wordpress.org/trunk@39214
git-svn-id: http://core.svn.wordpress.org/trunk@39154 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This helps affirm that your upload is fine, and has not been reduced down to the first page or changed into an image. This applies to the attachment details modal in the media library, where media is also now centered in the preview area.
props folletto, helen.
fixes#38717.
Built from https://develop.svn.wordpress.org/trunk@39213
git-svn-id: http://core.svn.wordpress.org/trunk@39153 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Due to the `clear_update_cache` parameter not being respected, update caches were being cleared incorrectly which prevented multiple plugins to be updated at the same time in background updates - failing with a `fs_unavailable` error message.
Fixes#38024
Built from https://develop.svn.wordpress.org/trunk@39211
git-svn-id: http://core.svn.wordpress.org/trunk@39151 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously there was no way to remove the user locale setting again, even though that might be desirable.
This adds a new 'Site Default' option to the user-specific language setting by introducing a new `show_site_locale_default` argument to `wp_dropdown_languages()`.
Props ocean90.
See #29783.
Fixes#38632.
Built from https://develop.svn.wordpress.org/trunk@39169
git-svn-id: http://core.svn.wordpress.org/trunk@39109 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes regression introduced with the addition of control notifications in [37476]. The container element for notifications is injected after the `.customize-control-title` element if the `.customize-control-notifications-container` element does not already exist in the control's template. Also adds missing margin between current image and uploaded images.
Props bradyvercher.
See #34893.
Fixes#38561.
Built from https://develop.svn.wordpress.org/trunk@39145
git-svn-id: http://core.svn.wordpress.org/trunk@39085 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Currently, the "Collapse menu" item is not focusable and keyboard users can't collapse/expand the admin menu. This aims to fix it so that screen readers no longer announce it as a clickable but it remains unfocusable and thus unusable. So it's now a button.
Quoting joedolson at WordCamp Chicago 2014:
"If it's supposed to act like a button, it should be a button."
Also includes a grunt:precommit run that picked up some postcss changes to src/wp-includes/css/customize-preview.css
Fixes#29958.
Props ajercia, ipm-frommen for an iterative patch, valendesigns for an iterative patch, GaryJ for feedback, joedolson for feedback, helen for feedback
Built from https://develop.svn.wordpress.org/trunk@39141
git-svn-id: http://core.svn.wordpress.org/trunk@39081 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This is a great goal for core, and is close, but it is not in shape to be shipped for 4.7 and there is not enough time left in the development cycle to alter and polish sufficiently. There are bugs, but more than that, there are more fundamental questions around the use of existing UI, general UX, and how findable themes are (not) on the .org side.
see #37661.
Built from https://develop.svn.wordpress.org/trunk@39140
git-svn-id: http://core.svn.wordpress.org/trunk@39080 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When themes register default headers, they can use sprintf style placeholder
strings in place of the template directory URI, which WordPress transforms
in several places by running the value of
`get_theme_support( 'custom-header', 'default-image' )` through `sprintf()`.
This fixes a few places where WordPress skipped the `sprintf()` step and
referenced the `get_theme_support()` value directly.
Props bradyvercher for initial patch.
See #38557.
Built from https://develop.svn.wordpress.org/trunk@39123
git-svn-id: http://core.svn.wordpress.org/trunk@39063 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Sets `screwIE8` to false as it is now enabled by default
Files Changed:
build/wp-admin/js/customize-nav-menus.min.js
build/wp-admin/js/customize-widgets.min.js
build/wp-includes/js/customize-loader.min.js
Changelog:
2016-07-19 v2.0.0 Update uglify-js to v2.7.0. screwIE8 is enabled by default.
2016-07-19 v1.0.2 Update grunt to ^1.0.0. Fix beautify when passed as an object. Fix docs about report values.
See #38199.
Built from https://develop.svn.wordpress.org/trunk@39117
git-svn-id: http://core.svn.wordpress.org/trunk@39059 1a063a9b-81f0-0310-95a4-ce76da25c4cd
If a value is sanitized in PHP and differs from the JS value in the pane, a `change` event for the setting is triggered upon refresh. This should be avoided since the value just came from the server as being sanitized. This also fixes periodic issue where selective refresh happens immediately after a full refresh.
Fixes#37032.
Built from https://develop.svn.wordpress.org/trunk@39112
git-svn-id: http://core.svn.wordpress.org/trunk@39054 1a063a9b-81f0-0310-95a4-ce76da25c4cd
While "Menu/Theme locations" was descriptive of what the choices listed were, in the context of editing an individual nav menu it is more descriptive to use a setting label that tells you what it is you are affecting for that nav menu, which is where it will be displayed. Technically multiple locations can be chosen, but in practice that appears to be rare enough that we can avoid an awkward "location(s)" type string.
props Fencer04 for the initial patch.
fixes#38525.
Built from https://develop.svn.wordpress.org/trunk@39098
git-svn-id: http://core.svn.wordpress.org/trunk@39040 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This partially reverts [35738], which has shown to provide a bad user experience for users seeking to experiment with TwentySeventeen.
This will result in TwentySixteen being installed in addition to TwentySeventeen.
See #38551.
Built from https://develop.svn.wordpress.org/trunk@39064
git-svn-id: http://core.svn.wordpress.org/trunk@39006 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously a user could remove a protected meta field by using their browser developer tools to alter the form field properties in the Custom Fields meta box, given that they know the ID of the protected meta field. This change prevents this by preventing any change to a protected meta field, including changing its key.
Props ajoah, johnbillion, peterwilsoncc
Fixes#38293
Built from https://develop.svn.wordpress.org/trunk@39062
git-svn-id: http://core.svn.wordpress.org/trunk@39004 1a063a9b-81f0-0310-95a4-ce76da25c4cd
On the Multisite - single site "Add New User" screen, some form fields have more
than one label associated with them. Form controls should have at most one
associated label element. If more than one label element is associated to the
control, assistive technologies may not read the appropriate label.
Additionally, labels can be associated to their related form fields either
explicitly (using a `for` attribute referencing the field ID) or implicitly
(using the label to wrap the field). As a best practice, never do both and
prefer explicitly associated labels when possible.
Props Ankit K Gupta.
Fixes#38459.
Built from https://develop.svn.wordpress.org/trunk@39006
git-svn-id: http://core.svn.wordpress.org/trunk@38948 1a063a9b-81f0-0310-95a4-ce76da25c4cd
A theme can opt-in for tailored starter content to apply to the customizer when previewing the theme on a fresh install, when `fresh_site` is at its initial `1` value. Starter content is staged in the customizer and does not go live unless the changes are published. Initial starter content is added to Twenty Seventeen.
* The `fresh_site` flag is cleared when a published post or page is saved, when widgets are modified, or when the customizer state is saved.
* Starter content is registered via `starter-content` theme support, where the argument is an array containing `widgets`, `posts`, `nav_menus`, `options`, and `theme_mods`. Posts/pages in starter content are created with the `auto-draft` status, re-using the page/post stubs feature added to nav menus and the static front page controls.
* A `get_theme_starter_content` filter allows for plugins to extend a theme's starter content.
* Starter content in themes can/should re-use existing starter content items in core by using named placeholders.
* Import theme starter content into customized state when fresh site.
* Prevent original_title differences from causing refreshes if title is present.
* Ensure nav menu item url is set according to object when previewing.
* Make sure initial saved state is false if there are dirty settings without an existing changeset.
* Ensure dirty settings are cleaned upon changeset publishing.
Props helen, westonruter, ocean90.
Fixes#38114, #38533.
Built from https://develop.svn.wordpress.org/trunk@38991
git-svn-id: http://core.svn.wordpress.org/trunk@38934 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- adds hidden text to the pagination links
- slightly increases the links clickable area
- fixes a JS error when clicking on the current page number
- avoids to generate nested `<div>` elements at each click
Props xavortm, cwpnolen, afercia.
Fixes#35577.
Built from https://develop.svn.wordpress.org/trunk@38981
git-svn-id: http://core.svn.wordpress.org/trunk@38924 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Edit shortcuts show initially for a moment and then fade away so as to not get in the way of the preview.
* Visibility of edit shortcuts is toggled by clicking/touching anywhere inert in the document.
* Implements UI for mobile and touch devices which do not support shift-click.
* Adds `editShortcutVisibility` state.
* Adds new methods to `wp.customize.selectiveRefresh.Partial` for managing edit shortcuts.
Incorporates aspects of the Customize Direct Manipulation feature plugin.
Props sirbrillig, mattwiebe, celloexpressions, melchoyce, westonruter, afercia.
Fixes#27403.
Built from https://develop.svn.wordpress.org/trunk@38967
git-svn-id: http://core.svn.wordpress.org/trunk@38910 1a063a9b-81f0-0310-95a4-ce76da25c4cd
With the introduction of user-specific languages in [38705] it's necessary to be able to switch translations on the fly. For example emails should be sent in the language of the recipient and not the one of the current user.
This introduces a new `WP_Locale_Switcher` class which is used for switching locales and translations. It holds the stack of locales whenever `switch_to_locale( $locale )` is called. With `restore_previous_locale()` you can restore the previous locale. `restore_current_locale()` empties the stack and sets the locale back to the initial value.
`switch_to_locale()` is added to most of core's email functions, either with the value of `get_locale()` (site language) or `get_user_locale()` (user language with fallback to site language).
Props yoavf, tfrommen, swissspidy, pbearne, ocean90.
See #29783.
Fixes#26511.
Built from https://develop.svn.wordpress.org/trunk@38961
git-svn-id: http://core.svn.wordpress.org/trunk@38904 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WordPress has supported custom page templates for over 12 years, allowing developers to create various layouts for specific pages.
While this feature is very helpful, it has always been limited to the 'page' post type and not was not available to other post types.
By opening up the page template functionality to all post types, we continue to improve the template hierarchy's flexibility.
In addition to the `Template Name` file header, the post types supported by a template can be specified using `Template Post Type: post, foo, bar`.
When at least one template exists for a post type, the 'Post Attributes' meta box will be displayed in the back end, without the need to add post type support for `'page-attributes'`. 'Post Attributes' can be customized per post type using the `'attributes'` label when registering a post type.
Props johnbillion, Mte90, dipesh.kakadiya, swissspidy.
Fixes#18375.
Built from https://develop.svn.wordpress.org/trunk@38951
git-svn-id: http://core.svn.wordpress.org/trunk@38894 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When support for PDFs is available, on upload,
render 'Thumbnail', 'Medium', 'Large', and 'Full' sizes of
the first page, and save them in attachment meta.
Use these renders within Add Media, Media Gallery and List views,
Attachment Details, Post/Attachment Edit screens, and Attachment pages.
Support available by default via Imagick -> ImageMagick -> Ghostscript,
but can be provided by any `WP_Image_Editor` that supports PDFs.
Props adamsilverstein, azaozz, celloexpressions, desrosj, dglingren, ericlewis, ipstenu, joemcgill, joyously, markoheijnen, melchoyce, mikeschroder, tomauger.
Fixes#31050.
Built from https://develop.svn.wordpress.org/trunk@38949
git-svn-id: http://core.svn.wordpress.org/trunk@38892 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduces new control for managing the background position. Adds control for setting the `background-size`.
Props cdog, celloexpressions, grapplerulrich, MikeHansenMe, FolioVision, afercia, helen, melchoyce, karmatosed, westonruter, Kelderic, sebastian.pisula.
Fixes#22058.
Built from https://develop.svn.wordpress.org/trunk@38948
git-svn-id: http://core.svn.wordpress.org/trunk@38891 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The color control in the customizer can use the new mode by supplying the `mode` param with `hue` (as opposed to the new default `full` value). New control replaces the `range` control in Twenty Seventeen for `colorscheme_hue`. The `wpColorPicker` can opt for hue-only mode via supplying `hue` as the `type` option. Iris Color Picker is updated from v1.0.7 to v1.1.0-beta.
Props mattwiebe, celloexpressions.
Fixes#38263.
Built from https://develop.svn.wordpress.org/trunk@38931
git-svn-id: http://core.svn.wordpress.org/trunk@38874 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This ability was previously added to nav menus via the available page items panel. The "Add New Page" button only appears when the `allow_addition` control param is supplied as `true`. Code is adapted from the Customize Posts feature plugin.
Props celloexpressions, westonruter.
See #38013, #34923.
Fixes#38164.
Built from https://develop.svn.wordpress.org/trunk@38906
git-svn-id: http://core.svn.wordpress.org/trunk@38849 1a063a9b-81f0-0310-95a4-ce76da25c4cd
An empty string causes some browsers to use the current URL as the `href`. When using `history.replaceState()` Chrome will re-fetch the favicon with each call, meaning that `customize.php` gets hit with wasted requests which tax the server.
Fixes#38377.
Built from https://develop.svn.wordpress.org/trunk@38901
git-svn-id: http://core.svn.wordpress.org/trunk@38844 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously we ensured that the entry points to WordPress were parsable by PHP4 in order to display a friendly not-supported-php error message.
However, for the last two years the main entry points have not actually parsed, and we've only added extra parse errors since it last worked in 3.9, so it's time we just remove this 'feature'.
The PHP version checks are still there for PHP 5.0/5.1, and so it's inplace when we eventually drop PHP 5.2 support.
See #29489.
Built from https://develop.svn.wordpress.org/trunk@38899
git-svn-id: http://core.svn.wordpress.org/trunk@38842 1a063a9b-81f0-0310-95a4-ce76da25c4cd
There are a handful of places where we don't check that the XML functions exist before we use them. Ubuntu's PHP 7 packages don't include PHP-XML by default, increasing the chance of this causing issues.
Props kraftbj, markoheijnen.
Fixes#37122.
Built from https://develop.svn.wordpress.org/trunk@38883
git-svn-id: http://core.svn.wordpress.org/trunk@38826 1a063a9b-81f0-0310-95a4-ce76da25c4cd
On the Header Image section, the previously uploaded images disappeared off-screen
when using the keyboard to navigate and the remove "X" button got keyboard focus.
Changing the off-screen CSS technique used for the "X" buttons fixes it.
- improves the focus style on the previously uploaded and suggested images
- removes a `tabindex="0"` attribute from the current header image
Fixes#38156.
Built from https://develop.svn.wordpress.org/trunk@38881
git-svn-id: http://core.svn.wordpress.org/trunk@38824 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- changes the "X" links in buttons, improves their color contrast ratio and focus style
- adds screen reader text "Remove item: + tagname"
- uses `wp.a11y.speak()` to give screen reader users feedback when adding/removing tags
- makes the `tagcloud-link` toggle a button, with an `aria-expanded` attribute to indicate the tag cloud collapsed/expanded state
- changes colors for the autocomplete highlighted option in order to have a better color contrast ratio
- reduces the font size for the autocomplete on Press This
- removes CSS related to the old `suggest.js` from Press This
Props joedolson, cgrymala, azaozz, afercia.
Fixes#27555.
Built from https://develop.svn.wordpress.org/trunk@38880
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Improve performance of Emoji tests and loading of the polyfill.
Reduces the number of tests to determine browser support for emoji to those most likely to fail. Adds the defer flag to the loaded scripts for browsers lacking support.
Props superpoincare for perf testing, peterwilsoncc.
Fixes#37817.
Built from https://develop.svn.wordpress.org/trunk@38869
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* Custom CSS is associated with a given theme and is displayed in an inline `style` element at the `wp_head` hook after the `wp_print_styles` is called so that it overrides any enqueued stylesheets.
* A `wp_get_custom_css()` function is used for accessing the CSS associated with the current theme (or another theme) and a `wp_get_custom_css` filter for manipulating it.
* CSS is managed in customizer via a new "Additional CSS" section with a single `textarea` control.
* `WP_Customize_Section::$description_hidden` is introduced for hiding extended descriptions in customizer sections behind a help toggle as done with panels.
* CSS is stored in a `custom_css` post type with the theme (stylesheet) slug as the `post_name`.
* `WP_Customize_Custom_CSS_Setting` is introduced to handle validation of CSS, previewing, and persisting the CSS to the `custom_css` post type.
* The `custom_css` setting is tied to a new `unfiltered_css` capability which maps to `unfiltered_html` by default.
* Escaping the message in the notification template is removed to allow markup (`code` tags) to be rendered.
See https://make.wordpress.org/core/2016/10/11/feature-proposal-better-theme-customizations-via-custom-css-with-live-previews/
Props johnregan3, celloexpressions, folletto, westonruter.
Fixes#35395.
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