Commit Graph

35757 Commits

Author SHA1 Message Date
Sergey Biryukov
a7af7c89a4 Text Changes: Unify permission error messages in wp-admin/users.php.
Props ramiy.
Fixes #38804.
Built from https://develop.svn.wordpress.org/trunk@39258


git-svn-id: http://core.svn.wordpress.org/trunk@39198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 22:25:30 +00:00
Sergey Biryukov
07cf16f7ba REST API: Unify permission error messages.
Props ramiy.
Fixes #38803.
Built from https://develop.svn.wordpress.org/trunk@39257


git-svn-id: http://core.svn.wordpress.org/trunk@39197 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 22:23:30 +00:00
Helen Hou-Sandí
d4603ec9b7 Theme starter content: Add more social link items to select from.
New: Foursquare, GitHub, LinkedIn, Pinterest, and YouTube. They are also now all alphabetized.

see #38615.

Built from https://develop.svn.wordpress.org/trunk@39256


git-svn-id: http://core.svn.wordpress.org/trunk@39196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 21:20:31 +00:00
Helen Hou-Sandí
8485582c8a Theme starter content: Revamp the credits widget into an about widget.
The credits widget from the original commit was a nice test to see the date changing, but isn't really very inspirational. Also, implement it in Twenty Seventeen.

see #38615.

Built from https://develop.svn.wordpress.org/trunk@39255


git-svn-id: http://core.svn.wordpress.org/trunk@39195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 21:08:30 +00:00
Sergey Biryukov
ec0043c279 I18N: Remove <code> tags from translatable strings in wp-includes/class-wp-customize-manager.php.
Props ramiy.
Fixes #38802.
Built from https://develop.svn.wordpress.org/trunk@39254


git-svn-id: http://core.svn.wordpress.org/trunk@39194 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 20:54:30 +00:00
Sergey Biryukov
a45e419926 Text Changes: Unify permission error message in wp-ajax-response.js.
See #34521.
Built from https://develop.svn.wordpress.org/trunk@39253


git-svn-id: http://core.svn.wordpress.org/trunk@39193 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 20:42:30 +00:00
Sergey Biryukov
9c2ea0b8c7 REST API: Remove two duplicate strings, use the ones we already have.
See #38791.
Built from https://develop.svn.wordpress.org/trunk@39252


git-svn-id: http://core.svn.wordpress.org/trunk@39192 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 20:40:29 +00:00
Sergey Biryukov
cc14606094 REST API: Unify permission error messages.
Props ramiy.
See #38791, #34521.
Built from https://develop.svn.wordpress.org/trunk@39251


git-svn-id: http://core.svn.wordpress.org/trunk@39191 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 20:37:32 +00:00
Joe Hoyle
d049f72459 REST API: Clean up argument and property types.
There's a couple of places where we were missing type notes for arguments, which mainly affects documentation.

Props jnylen0.
Fixes #38792.

Built from https://develop.svn.wordpress.org/trunk@39250


git-svn-id: http://core.svn.wordpress.org/trunk@39190 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 18:16:30 +00:00
Helen Hou-Sandí
19bb9c2fe0 Customize: More visible focus and hover states for close and back buttons.
props celloexpressions, folletto.
fixes #29158.

Built from https://develop.svn.wordpress.org/trunk@39249


git-svn-id: http://core.svn.wordpress.org/trunk@39189 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 18:11:31 +00:00
Joe McGill
984ef6288a Twenty Seventeen: Compress the default header image.
This replaces the default `header.jpg` with a compressed version.
The original was 209KB and the new version is 143KB with almost no
distinguishable visual loss.

Props Presskopp.
Fixes #38793.
Built from https://develop.svn.wordpress.org/trunk@39248


git-svn-id: http://core.svn.wordpress.org/trunk@39188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 18:01:33 +00:00
Andrea Fercia
dff34d5988 Accessibility: Improve the Post Attributes meta box fields labels.
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
2016-11-15 16:01:30 +00:00
Joe McGill
36ac7287b0 Media: Make PDF preview sizes filterable.
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
2016-11-15 13:26:30 +00:00
Sergey Biryukov
65fb74561b REST API: After [39238] and [39239], move the remaining translator comments to preceding line.
See #38791.
Built from https://develop.svn.wordpress.org/trunk@39245


git-svn-id: http://core.svn.wordpress.org/trunk@39185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 13:07:33 +00:00
Dominik Schilling
a800e652c6 Docs: Apply documentation standards to the new get_available_languages filter.
See #38788.
Built from https://develop.svn.wordpress.org/trunk@39244


git-svn-id: http://core.svn.wordpress.org/trunk@39184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 09:52:32 +00:00
Weston Ruter
011391007c Customize: Ensure edit shortcuts have same background color regardless of theme colors.
Fixes #38776.

Built from https://develop.svn.wordpress.org/trunk@39243


git-svn-id: http://core.svn.wordpress.org/trunk@39183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 09:14:31 +00:00
Weston Ruter
31d4be0293 Customize: Add !important line-height to edit shortcut buttons.
Ensure that icon inside edit shortcut is centered when theme defines default `line-height` for `button` elements.

Fixes #38787.

Built from https://develop.svn.wordpress.org/trunk@39242


git-svn-id: http://core.svn.wordpress.org/trunk@39182 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 09:08:31 +00:00
Weston Ruter
8efc416f64 Customize: Allow starter content to apply in a new theme when switching from another theme containing changes.
* Ensure that starter content can apply from theme B after previewing starter content in theme A.
* Introduce new `starter_content` flag in changeset setting params which is used to capture whether a value is starter content and thus can be overridden.
* Create changeset up-front with `starter_content` flags instead of waiting for `AUTOSAVE_INTERVAL`.
* Eliminate instantiation of settings for widget instances in favor of directly calling `sanitize_widget_js_instance`. This eliminates issues with looking for widgets before they are registered.
* Ensure that non-placeholders (inline arrays instead of string references) can be supplied in starter content.
* Re-use auto-draft posts as starter content across theme switches.
* Introduce `starter_content` param for `WP_Customize_Manager::save_changeset_post()` which is `false` except when starter content is being loaded on a `fresh_site`.

See #38114.
Fixes #38541.

Built from https://develop.svn.wordpress.org/trunk@39241


git-svn-id: http://core.svn.wordpress.org/trunk@39181 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 09:03:32 +00:00
Peter Wilson
11998b4169 Themes: Remove front page restriction from video header functions.
Adds a callback for determining when video headers should be displayed in themes supporting custom headers. By default, video headers are only displayed on the front page of a site.

Theme authors may set a custom callback by passing `'video-active-callback' => 'mytheme_video_active_callback'` as an argument. The default callback is `is_front_page()`.

This introduces the new function `is_header_video_active()` - returns `true` on pages that should display video headers. The return value can be filtered using the new filter of the same name.

Props flixos90, bradyvercher, peterwilsoncc, joemcgill.
Fixes #38738.

Built from https://develop.svn.wordpress.org/trunk@39240


git-svn-id: http://core.svn.wordpress.org/trunk@39180 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 07:16:33 +00:00
Ryan McCue
0f5a44e093 REST API: Move translator comments to preceding line.
Inline translator comments break POT file generation.

Props dd32.
See #38791.

Built from https://develop.svn.wordpress.org/trunk@39239


git-svn-id: http://core.svn.wordpress.org/trunk@39179 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 05:39:32 +00:00
Ryan McCue
705f17cea2 REST API: Add translator comments to text with placeholders.
Props dimadin.
Fixes #38791.

Built from https://develop.svn.wordpress.org/trunk@39238


git-svn-id: http://core.svn.wordpress.org/trunk@39178 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 04:28:31 +00:00
Weston Ruter
de0835dead Customize: Only show video header controls if previewing front page; show explanatory notice when controls are hidden.
Also include todo for the `header_video` control's `button_labels`. See #38796.

Props westonruter, joemcgill, celloexpressions.
Fixes #38778.

Built from https://develop.svn.wordpress.org/trunk@39237


git-svn-id: http://core.svn.wordpress.org/trunk@39177 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 03:47:30 +00:00
Peter Wilson
21248ce3ab Posts, Post Types: Improve sanitisation of templates' post types.
Prevents post type templates ignoring post types due to invalid characters. Each entry in the `Template Post Type` comment is run through `sanitize_key()` to match the sanitisation used by `register_post_type()`.

Fixes #38766.

Built from https://develop.svn.wordpress.org/trunk@39236


git-svn-id: http://core.svn.wordpress.org/trunk@39176 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 03:37:31 +00:00
Gary Pendergast
fc1255a2c7 I18N: Add the get_available_languages filter.
Sometimes, a language file may not exist in exactly the format or location that `get_available_languages()` expects it to be in - for sites with this level of customisation, they need to be able to add their own language files to the list of those available.

Props yoavf.
Fixes #38788.


Built from https://develop.svn.wordpress.org/trunk@39235


git-svn-id: http://core.svn.wordpress.org/trunk@39175 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 01:19:31 +00:00
Weston Ruter
8e6753cead Customize: Use video-specific labels for buttons in Header Video media control.
See #38172.

Built from https://develop.svn.wordpress.org/trunk@39234


git-svn-id: http://core.svn.wordpress.org/trunk@39174 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 00:22:30 +00:00
Weston Ruter
a69d66bac3 Customize: Adjust layout for edit shortcuts only when shown.
Add theme-specific positioning of edit shortcuts in Twenty Fourteen and Twenty Seventeen.

Props sirbrillig, sstoqnov, westonruter.
Fixes #38651.

Built from https://develop.svn.wordpress.org/trunk@39233


git-svn-id: http://core.svn.wordpress.org/trunk@39173 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-15 00:15:30 +00:00
Tammie Lister
56723c61c6 Twenty Seventeen: Fix for mobile menu parent items requiring double tap
After further review from the accessibility team, it was determined that the menu items with sub-menus don't need the aria-haspopup attribute.

Props davidakennedy, celloexpressions, voldemortensen, afercia
See #38397


Built from https://develop.svn.wordpress.org/trunk@39232


git-svn-id: http://core.svn.wordpress.org/trunk@39172 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 22:34:31 +00:00
Helen Hou-Sandí
79cabf64b1 Theme starter content: Add context to all strings.
fixes #38770.

Built from https://develop.svn.wordpress.org/trunk@39231


git-svn-id: http://core.svn.wordpress.org/trunk@39171 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 21:38:32 +00:00
Dominik Schilling
c3dc173799 I18N: Don't use get_available_languages() in _load_textdomain_just_in_time().
`get_available_languages()` is only designed to work with translations for core. Using it for plugins/themes means unnecessary `strpos()` checks and incomplete results for plugins/themes whose names are beginning with `admin-` or `ms-`.

Props swissspidy, ocean90.
Fixes #38590.
Built from https://develop.svn.wordpress.org/trunk@39230


git-svn-id: http://core.svn.wordpress.org/trunk@39170 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 21:07:30 +00:00
Weston Ruter
9daebf050a Customize: Maximize height of Custom CSS textarea without causing doubled scrollbars.
Textarea will fill vertical height of Custom CSS section for browsers that support `calc()` and when plugins don't add other controls to the section. Also run CSS autoprefixer.

Props michaelarestad, westonruter.
See #35395.
Fixes #38755.

Built from https://develop.svn.wordpress.org/trunk@39229


git-svn-id: http://core.svn.wordpress.org/trunk@39169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 19:12:30 +00:00
Weston Ruter
05a9259cc5 Customize: Improve styles for hover, focus, and active states on edit shortcuts.
Props michaelarestad.
Fixes #38758.

Built from https://develop.svn.wordpress.org/trunk@39228


git-svn-id: http://core.svn.wordpress.org/trunk@39168 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 18:49:30 +00:00
Weston Ruter
dfbcdae985 Customize: Use selective refresh for custom header changes when possible.
* Use `postMessage` transport for header image settings by default when video headers are supported, and thus `the_custom_header_markup()` will necessarily be used (and thus a selective refresh partial will be available).
* Ensure that `the_custom_header_markup()` always outputs a container element in the customizer preview even if the header is empty.
* Ensure that edit shortcut appearing for custom header does not get positioned off-screen.

Props bradyvercher, westonruter.
See #38639.
Fixes #38737.

Built from https://develop.svn.wordpress.org/trunk@39227


git-svn-id: http://core.svn.wordpress.org/trunk@39167 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 18:41:32 +00:00
Tammie Lister
9ef40ced2f Twenty Fourteen: Removes video header support
Support was added to test implementation but never completed. This removes the test implementation.

Props davidakennedy
Fixes #38783

Built from https://develop.svn.wordpress.org/trunk@39226


git-svn-id: http://core.svn.wordpress.org/trunk@39166 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 17:17:31 +00:00
Tammie Lister
9e110f8aed Twenty Seventeen: Resolves focused controls hidden by the top menu.
When a page is scrolled, the top nav menu become fixed. Depending on the page content this caused issue where focused links or buttons may be hidden behind the  nav menu.

Props afercia, davidakennedy, Fencer04
Fixes #38476


Built from https://develop.svn.wordpress.org/trunk@39225


git-svn-id: http://core.svn.wordpress.org/trunk@39165 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 17:01:30 +00:00
Tammie Lister
1c2343e4ea Twenty Seventeen: Fixes custom header text color issues
Removes default header text color and updates and updates selectors.

Props laurelfulford, davidakennedy, Idealien
Fixes #38391


Built from https://develop.svn.wordpress.org/trunk@39224


git-svn-id: http://core.svn.wordpress.org/trunk@39164 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 16:49:32 +00:00
Joe Hoyle
a4fa8c528f REST API: Make all collection params filterable.
For developers wanting to add their own registered collection parameters, they can now use the `rest_$type_collection_params` filter. This brings consistency with the already existing `rest_$post_type_collection_params`.

Fixes #38710.
Props jnylen0.

Built from https://develop.svn.wordpress.org/trunk@39223


git-svn-id: http://core.svn.wordpress.org/trunk@39163 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 16:42:31 +00:00
Joe Hoyle
5c90d9ed8e REST API: Validate and Sanitize registered meta based off the schema.
With the addition of Array support in our schema validation functions, it's now possible to use these in the meta validation and sanitization steps. Also, this increases the test coverage of using registered via meta the API significantly.

Fixes #38531.
Props rachelbaker, tharsheblows.

Built from https://develop.svn.wordpress.org/trunk@39222


git-svn-id: http://core.svn.wordpress.org/trunk@39162 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 16:36:33 +00:00
David A. Kennedy
b6e848e638 Twenty Seventeen: Make sure theme JavaScript follows proper coding standards
Props sstoqnov, afercia.

Fixes #38752.

Built from https://develop.svn.wordpress.org/trunk@39221


git-svn-id: http://core.svn.wordpress.org/trunk@39161 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 11:41:31 +00:00
David A. Kennedy
f5cdba121f Twenty Seventeen: Make custom header preview match front end in Customizer when changed
* Toggles `has-header-image` body class  in Customizer preview whenever images or videos are added or removed.
* Hides the `.custom-header-image`div in CSS when an image or video haven't been set so preview changes are smoother.
* Also fixes the main issues in #38391 – making the preview match.

Props bradyvercher.

Fixes #38627.
See #38391.

Built from https://develop.svn.wordpress.org/trunk@39220


git-svn-id: http://core.svn.wordpress.org/trunk@39160 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 11:23:32 +00:00
Ryan McCue
65664731e9 REST API: Improve validation for usernames and passwords.
Also improves the slashing of user data in the REST API to avoid data loss.

Props jnylen0.
Fixes #38739.

Built from https://develop.svn.wordpress.org/trunk@39219


git-svn-id: http://core.svn.wordpress.org/trunk@39159 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 07:13:31 +00:00
Weston Ruter
c3f31ce550 Customize: Remove root panel description text which notes that edit shortcuts can be toggled by clicking anywhere in the preview.
Amends [39131], in which this method of toggling edit shortcuts was removed.
Props presskopp.
See #27403.

Built from https://develop.svn.wordpress.org/trunk@39218


git-svn-id: http://core.svn.wordpress.org/trunk@39158 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 04:33:32 +00:00
Andrew Ozz
0c2b137a60 TinyMCE: fix black outline around _moz_abspos. This is added in Firefox in paragraphs inserted after a non-editable block.
See #38757.
Built from https://develop.svn.wordpress.org/trunk@39217


git-svn-id: http://core.svn.wordpress.org/trunk@39157 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-14 02:34:31 +00:00
David A. Kennedy
126c7e4c72 Twenty Seventeen: Adds numbers to the table of contents in style.css
Props karmatosed.

Fixes #38767.

Built from https://develop.svn.wordpress.org/trunk@39216


git-svn-id: http://core.svn.wordpress.org/trunk@39156 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-13 23:45:32 +00:00
David A. Kennedy
d902f1f167 Twenty Seventeen: Fix Customizer preview display issues in IE9
IE9 doesn't understands `vh ` (vertical height) when inside of an `iframe`. Normally IE9 will understand `vh` as the vertical height relative to the viewport, but in an `iframe`, IE9 thinks the vertical height is relative to the size of the whole page. So this fixes that when the site is viewed in the Customizer preview – an `iframe`.

Props laurelfulford.

Fixes #38722.

Built from https://develop.svn.wordpress.org/trunk@39215


git-svn-id: http://core.svn.wordpress.org/trunk@39155 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-13 23:31:31 +00:00
Weston Ruter
fd166077ad Customize: Prevent the "Hide Controls" button label from overrunning the device preview buttons.
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
2016-11-13 19:00:35 +00:00
Helen Hou-Sandí
81f9cc26a1 Media: Clearly indicate that PDF thumbnails are just document previews.
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
2016-11-13 16:39:31 +00:00
Dion Hulse
35a0240fb2 WP_HTTP: Map internal Requests hooks to WordPress actions.
This change introduces a `requests-{$hook}` action which can be used to hook into Requests hooks, and restores the `http_api_curl` action.

Props rmccue.
Fixes #37843.

Built from https://develop.svn.wordpress.org/trunk@39212


git-svn-id: http://core.svn.wordpress.org/trunk@39152 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-13 10:36:29 +00:00
Dion Hulse
dd0411161d Updates: Allow background updates to update multiple plugins/themes in the same request.
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
2016-11-13 09:53:32 +00:00
Dion Hulse
5f7bbe66d7 Posts, Post Types: Fix Quick Edit to correctly set the page template for non-hierarchical post types.
Props dd32, swissspidy.
Fixes #38655.

Built from https://develop.svn.wordpress.org/trunk@39210


git-svn-id: http://core.svn.wordpress.org/trunk@39150 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-13 07:42:31 +00:00
Weston Ruter
e5b82c250f Customize: Improve extensibility of Custom CSS.
* Add `customize_value_custom_css` filter to `WP_Customize_Custom_CSS::value()` method.
* Introduce `customize_update_custom_css_post_content_args` filter in `WP_Customize_Custom_CSS::update()` method.
* Make clear that `wp_get_custom_css()` and `wp_get_custom_css` filter are specifically for obtaining the value to render/display. Eliminate use of `wp_get_custom_css()` when getting the setting value. Use the underlying `post_value` directly when `is_previewed`.
* Move anonymous functions handing JS previewing for `custom_logo`, `custom_css`, and `background` into named functions on the `wp.customize.settingPreviewHandlers` to allow plugins to override/extend preview logic.
* Update `_custom_background_cb` to always print a `style` tag wen in the customizer preview, and update background preview logic to replace existing style element instead of appending a new style to the head so that background changes don't unexpectedly override any Custom CSS in the preview's stylesheet cascade.

Props westonruter, georgestephanis.
See #22058.
Fixes #38672.

Built from https://develop.svn.wordpress.org/trunk@39209


git-svn-id: http://core.svn.wordpress.org/trunk@39149 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-13 02:43:29 +00:00