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.
Built from https://develop.svn.wordpress.org/trunk@46418
git-svn-id: http://core.svn.wordpress.org/trunk@46216 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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.
Built from https://develop.svn.wordpress.org/trunk@46375
git-svn-id: http://core.svn.wordpress.org/trunk@46174 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- 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.
Built from https://develop.svn.wordpress.org/trunk@46239
git-svn-id: http://core.svn.wordpress.org/trunk@46051 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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.
Built from https://develop.svn.wordpress.org/trunk@46164
git-svn-id: http://core.svn.wordpress.org/trunk@45976 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduces the `wp_image_resize_identical_dimensions` filter so plugins and themes can determine whether a new image with identical dimensions should be created, defaults to false.
Props wpdennis, HKandulla, galbaras, azaozz.
See #32437.
Built from https://develop.svn.wordpress.org/trunk@46077
git-svn-id: http://core.svn.wordpress.org/trunk@45889 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Add missing translator comments.
* Fix placement of some translator comments. Translator comments should be on the line directly above the line containing the translation function call for optimal compatibility with various `.pot` file generation tools. The CS auto-fixing, which changed some inconsistent function calls to multi-line function calls, is part of the reason why this was no longer the case for a select group of translator comments.
Includes minor code layout fixes.
Polyglots, rejoice! All WordPress core files now have translator comments for all strings with placeholders!
Props jrf, subrataemfluence, GaryJ, webdados, Dency, swissspidy, alvarogois, marcomartins, mihaiiceyro, vladwtz, niq1982, flipkeijzer, michielatyoast, chandrapatel, thrijith, joshuanoyce, FesoVik, tessak22, bhaktirajdev, cleancoded, dhavalkasvala, garrett-eclipse, bibliofille, socalchristina, priyankkpatel, 5hel2l2y, adamsilverstein, JeffPaul, pierlo, SergeyBiryukov.
Fixes#44360.
Built from https://develop.svn.wordpress.org/trunk@45926
git-svn-id: http://core.svn.wordpress.org/trunk@45737 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Makes sure the media modal dialog `h1` heading isn't empty when custom media frames don't set a title. This is particularly important now that the media modal is an ARIA dialog, as the title is referenced by an `aria-labelledby` attribute to properly label the dialog.
Props donmhico, audrasjb.
Fixes#47612.
Built from https://develop.svn.wordpress.org/trunk@45925
git-svn-id: http://core.svn.wordpress.org/trunk@45736 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Noteable changes:
- The `magic_quotes_runtime` and `magic_quotes_sybase` settings were removed in PHP 5.4, so no longer need to be set.
- Some functions that use external libraries can generate errors that can't be tested for, so are globally allowed to silence errors.
- Quite a few functions would cause errors if `safe_mode` was set. This setting was removed in PHP 5.4.
- Only a handful of `header()` calls needed corresponding `headers_sent()` checks for unit tests to pass, but more may need to be added as the nightlies builds are tested.
See #46732.
Built from https://develop.svn.wordpress.org/trunk@45611
git-svn-id: http://core.svn.wordpress.org/trunk@45422 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Introduces `wp_get_missing_image_subsizes()` and `wp_update_image_subsizes()` to generate image sub-sizes that are missing or were not created after the upload.
- Adds a way to display errors that happened while creating sub-sizes.
- Introduces `wp_create_image_subsizes()` intended for use after an image was uploaded. It saves/updates the image metadata immediately after each sub-size is created. This fixes the (long standing) problem when some of the sub-size image files were created but there was a timeout or an error and the metadata was not saved. Until now such uploads were considered "failed" which usually resulted in the user trying to upload the same image again, creating even more "orphan" image files.
Note that the patch also includes some unrelated WPCS fixes.
Props mikeschroder, azaozz.
See #40439.
Built from https://develop.svn.wordpress.org/trunk@45538
git-svn-id: http://core.svn.wordpress.org/trunk@45349 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Add a new media view: `wp.media.view.Heading` designed to add accessibility friendly headers in the media library/modal.
* Add an initial "Attachments list" heading above the attachments list.
Props afercia.
Fixes#36925.
Built from https://develop.svn.wordpress.org/trunk@44969
git-svn-id: http://core.svn.wordpress.org/trunk@44800 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Add a `human_readable_duration` function including tests.
* Add 'pixels' after image width/height.
* Add screen reader text for durations.
Props Presskopp, kiranpotphode, milindmore22, stormrockwell, afercia.
Fixes#39667.
Built from https://develop.svn.wordpress.org/trunk@43633
git-svn-id: http://core.svn.wordpress.org/trunk@43462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WPCS 1.0.0 includes a bunch of new auto-fixers, which drops the number of coding standards issues across WordPress significantly. Prior to running the auto-fixers, there were 15,312 issues detected. With this commit, we now drop to 4,769 issues.
This change includes three notable additions:
- Multiline function calls must now put each parameter on a new line.
- Auto-formatting files is now part of the `grunt precommit` script.
- Auto-fixable coding standards issues will now cause Travis failures.
Fixes#44600.
Built from https://develop.svn.wordpress.org/trunk@43571
git-svn-id: http://core.svn.wordpress.org/trunk@43400 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The personal data export and erasure tools allow plugins to register their own callbacks, in order to add additional data to the export and erasure processes. Previously, these were registered without specifying a constant identifier in the array of callbacks. Using mutable integers makes it difficult for plugins to modify the callbacks of other plugins, though.
Using associative array keys instead provides a covenient and reliable way to identify and interact with another plugin's callbacks.
Props desrosj, allendav, ocean90.
Fixes#43931.
Built from https://develop.svn.wordpress.org/trunk@43154
git-svn-id: http://core.svn.wordpress.org/trunk@42983 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This is a partial revert of [41724], so image captions include an
inline `width` style instead of `max-width`.
This returns the caption shortcode to the pre-4.9.0 behavior, while
retaining the extra unit test coverage added in [41724].
Fixes#43123. See #33981.
Built from https://develop.svn.wordpress.org/trunk@42837
git-svn-id: http://core.svn.wordpress.org/trunk@42667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The WPCS `WordPress.WhiteSpace.PrecisionAlignment` rule throws warnings for a bunch of code that will likely cause issues for `wpcbf`. Fixing these manually beforehand gives us better auto-fixed results later.
See #41057.
Built from https://develop.svn.wordpress.org/trunk@42228
git-svn-id: http://core.svn.wordpress.org/trunk@42057 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This is a follow up on r41732, implementing the following improvements:
* Attachment parent info is now stored in attachment meta rather than a
separate post meta key.
* Attachments created from contextual crops (e.g. header, logos, etc.) are
filtered out of the media library using a new `_filterContext` method in
`wp.media.controller.Library`.
Props joemcgill, westonruter.
See #21819.
Built from https://develop.svn.wordpress.org/trunk@41937
git-svn-id: http://core.svn.wordpress.org/trunk@41771 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Update to 2.1.9.
- Include the non-minified plupload.js and moxie.js.
- Remove support for Flash and Silverlight, the available runtime options are `html5` and `html4`.
- Delete plupload.flash.swf and plupload.silverlight.xap.
Fixes#41755.
Built from https://develop.svn.wordpress.org/trunk@41328
git-svn-id: http://core.svn.wordpress.org/trunk@41159 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In [38296] we replaced `get_post_meta()` with `wp_get_attachment_metadata()`
so that attachment metadata could be consistently filtered. However, this
results in extra post queries which were previously avoided.
This uses `_prime_post_caches()` instead of `update_meta_cache()` to improve
post caching before looping through all images to retrieve attachment metadata.
Props dlh.
Fixes#40490.
Built from https://develop.svn.wordpress.org/trunk@41315
git-svn-id: http://core.svn.wordpress.org/trunk@41146 1a063a9b-81f0-0310-95a4-ce76da25c4cd
There are now 3 places where we call out to the REST API from within wp-admin. This commit introduces a small library to allow overriding these calls, centralize nonce-passing logic, and eliminate the need to pass a full REST URL down to client code (this last feature is not yet used and will be explored in a separate ticket).
Fixes#40919.
Built from https://develop.svn.wordpress.org/trunk@41206
git-svn-id: http://core.svn.wordpress.org/trunk@41046 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes issue where Video widgets embedding external files fail to get recognized due to the presence of the `loop` param after the video filename, even though it has a recognized extension. Regardless, the `loop` param is only present to fix a Vimeo issue in ME.js 2.x.
Props timmydcrawford.
Amends [40640].
See #39686, #39994.
Fixes#40977.
Built from https://develop.svn.wordpress.org/trunk@40892
git-svn-id: http://core.svn.wordpress.org/trunk@40742 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugins may continue to add embedding support for these file formats by re-adding them via the `wp_video_extensions` and `wp_audio_extensions` filters while also implementing fallback rendering routines via the `wp_video_shortcode_override` and `wp_audio_shortcode_override` filters.
See #39994, #39995.
Fixes#40819.
Built from https://develop.svn.wordpress.org/trunk@40813
git-svn-id: http://core.svn.wordpress.org/trunk@40671 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_prepare_attachment_for_js()`:
- Normalize behavior when author does not exist by returning '(no author)' for `authorName` in these cases.
- Decode HTML entities in `author_name`.
- Add tests for both of the above.
Props arshidkv12, ocean90, sloisel, mikeschroder.
Fixes#39955.
Built from https://develop.svn.wordpress.org/trunk@40809
git-svn-id: http://core.svn.wordpress.org/trunk@40667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This avoids a couple of expensive queries that attempt to determine whether the media library contains any audio or video items, and also makes the UI for creating playlists more discoverable.
[40382] and [40421] added filters to allow overriding this behavior; this commit changes the default value of the filters to always show these UI buttons and never run the expensive queries. The old behavior can still be restored using the filters if desired.
Props sboisvert, adamsilverstein, joemcgill, jnylen0.
Fixes#31071.
Built from https://develop.svn.wordpress.org/trunk@40430
git-svn-id: http://core.svn.wordpress.org/trunk@40328 1a063a9b-81f0-0310-95a4-ce76da25c4cd
As a follow-up to [40382], this commit makes the following improvements:
- Make the filter names more specific.
- Fix the inline documentation (use `@param` instead of `@return).
- Use `null ===` instead of `is_null` to avoid extra function calls.
- Rename the `$has_audio` and `$has_video` variables now that they actually represent something slightly different.
See #31071.
Built from https://develop.svn.wordpress.org/trunk@40421
git-svn-id: http://core.svn.wordpress.org/trunk@40319 1a063a9b-81f0-0310-95a4-ce76da25c4cd
There are a couple of queries that do a full table scan of attachment posts to support features of the media library. Pending a more complete solution, allow overriding these queries via filters.
Props sboisvert, jnylen0.
See #31071.
Built from https://develop.svn.wordpress.org/trunk@40382
git-svn-id: http://core.svn.wordpress.org/trunk@40289 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes a regression in the media library after [38949], which caused
small images (< thumbnail size) to not display within the media library.
Accounts for images that have no intermediate sizes
in `wp_prepare_attachment_for_js()`.
Adds test.
Fixes#38965.
Props joemcgill, clorith, mikeschroder.
Built from https://develop.svn.wordpress.org/trunk@39396
git-svn-id: http://core.svn.wordpress.org/trunk@39336 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
This removes the fallbacks in `wp_get_attachment_image()` and in
`wp.media.string.props` which attempt to generate an `alt` value
from the image caption or title if an `alt` attribute isn't explicitly
set.
This allows for image HTML to be generated that contains an empty `alt`
value, i.e., `alt=""` which is much preferable for screen readers than
reading redundant content in the case of a caption, or when reading the
image title, which is often generated from the filename and not helpful
as `alt` text.
Props odie2, joedolson, rianrietveld, afercia, iamjolly, joemcgill.
Fixes#34635.
Built from https://develop.svn.wordpress.org/trunk@38812
git-svn-id: http://core.svn.wordpress.org/trunk@38755 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes the Add Themes toolbar padding. Standardizes the placeholders to no title
case and three trailing dots. Expands the Media search placeholder in
"Search media items..." for consistency with the Plugins and Themes toolbars.
Props mikeviele, jamesacero, mattking5000, koenschipper, dungengronovius.
Fixes#38010.
Built from https://develop.svn.wordpress.org/trunk@38795
git-svn-id: http://core.svn.wordpress.org/trunk@38738 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Running the taxonomy array through `array_unique()` is unnecessary
when the function returns objects, because the associative keys already
ensure uniqueness.
This also fixes a bug when running `get_attachment_taxonomies()` in
HHVM, which doesn't like casting objects to strings for the purposes
of `array_unique()`.
Props swissspidy.
See #37368.
Built from https://develop.svn.wordpress.org/trunk@38437
git-svn-id: http://core.svn.wordpress.org/trunk@38378 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* `wp-admin` and `wp-includes` are scanned for classes to autoload
* Several 3rd-party and Ryan McCue-shaped libraries are excluded when the classmap is generated, see `composer.json`: `autoload.exclude-from-classmap`
* `wp-vendor/autoload_52.php` is included at the top of `wp-settings.php` - no changes need to be made to unit tests to include the autoloader
* An avalanche of `require()` and `require_once()` calls that loaded class files have been removed from the codebase.
The following files have been added to `svn:ignore` - they are not 5.2-compatible and fail during pre-commit:
* src/wp-vendor/autoload.php
* src/wp-vendor/composer/autoload_real.php
* src/wp-vendor/composer/autoload_static.php
* src/wp-vendor/composer/ClassLoader.php
We favor these files instead:
* src/wp-vendor/autoload_52.php
* src/wp-vendor/composer/autoload_real_52.php
* src/wp-vendor/composer/ClassLoader52.php
When new PHP classes are added to the codebase, simply run `composer install` or `composer update` from the project root to update the autoloader.
The future is now.
See #36335.
Built from https://develop.svn.wordpress.org/trunk@38399
git-svn-id: http://core.svn.wordpress.org/trunk@38340 1a063a9b-81f0-0310-95a4-ce76da25c4cd
By adding the `$output` parameter to `get_attachment_taxonomies()`, the
function signature matches that of `get_object_taxonomies()`. The change
also allows for more consistent behavior when passing `output=objects`
to `get_object_taxonomies()` for the 'attachment' object type, since
the `$output` parameter is now passed through the function stack.
Props codemovement.pk.
See #37368.
Built from https://develop.svn.wordpress.org/trunk@38292
git-svn-id: http://core.svn.wordpress.org/trunk@38233 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When `$size` is passed to `image_get_intermediate_size()` as an array of width
and height values and an exact image size matching those values isn't available,
the function loops through the available attachment sizes and returns the
smallest image larger than the requested dimensions with the same aspect ratio.
The aspect ratio check is skipped for the 'thumbnail' size to provide a fallback
for small sizes when no other image option is available. This resulted in a poor
selection when the size requested was smaller than the 'thumbnail' dimensions
but a larger size matching the requested ratio existed.
This refactors the internals of `image_get_intermediate_size()` to ensure the
'thumbnail' size is only returned as a fallback to small sizes once all other
options have been considered, and makes the control flow easier to follow.
This also introduces a new helper function, `wp_image_matches_ratio()` for
testing whether the aspect ratios of two sets of dimensions match. This function
is also now used in `wp_calculate_image_srcset()` during the selection process.
Props flixos, joemcgill.
Fixes#34384, #34980.
Built from https://develop.svn.wordpress.org/trunk@38086
git-svn-id: http://core.svn.wordpress.org/trunk@38027 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In some cases, images in the media library may contain spaces in
their filenames. This results in an invalid `srcset` attribute,
causing broken images on the front end. This change fixes the issue
by replacing spaces in URLs with URL encoded '%20' characters before
returning the `srcset` string.
Props underdude, joemcgill.
Fixes#36549.
Built from https://develop.svn.wordpress.org/trunk@38052
git-svn-id: http://core.svn.wordpress.org/trunk@37993 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`wp_convert_hr_to_bytes()` was previously defined in wp-includes/media.php because it's only used by `wp_max_upload_size()` in the same file.
Moving this function to load.php allows us to improve core's memory limit handling.
See #32075.
Built from https://develop.svn.wordpress.org/trunk@38012
git-svn-id: http://core.svn.wordpress.org/trunk@37953 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_calculate_image_srcset()` we get an array of image sizes
associated with an attachment and then add the original image's
information to the array before processing the `srcset`. In doing
so, we set the original data to a `$image_sizes['full']` key, which
could stomp on any custom image sizes using `full` as a size name.
This avoid the issues by adding the original data without a named
key, which is never referenced anyway.
Props jaspermdegroot.
Fixes#36345.
Built from https://develop.svn.wordpress.org/trunk@37986
git-svn-id: http://core.svn.wordpress.org/trunk@37927 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The media library can contain files which aren't attached yet. When attaching a file you currently get "Media attachment reattached.", or the opposite "Media attachment detached.". That's redundant and can be inaccurate. It's also not easy to translate in some languages.
This change generalizes the strings to refer to a "media file" instead.
Props SergeyBiryukov, ocean90, netweb.
Fixes#36089.
Built from https://develop.svn.wordpress.org/trunk@36887
git-svn-id: http://core.svn.wordpress.org/trunk@36854 1a063a9b-81f0-0310-95a4-ce76da25c4cd
We rely on the `wp-image-` class to quickly find an attachment ID to add responsive image attributes.
To avoid incorrect images being displayed, do not add these attributes if the `src` does not match the
meta from the attachment ID in the class.
Props azaozz, kovshenin, joemcgill.
Fixes: #34898.
Built from https://develop.svn.wordpress.org/trunk@35820
git-svn-id: http://core.svn.wordpress.org/trunk@35784 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Fix `_wp_upload_dir_baseurl()` to cache by blog_id.
- Replace `path_join()` with `trailingslashit()`, it's much faster.
- Rename $image_url to $image_src for consistency (used at about 50 other places).
- Couple of tests fixes.
See #34430.
Built from https://develop.svn.wordpress.org/trunk@35498
git-svn-id: http://core.svn.wordpress.org/trunk@35462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- More fixes to inline docs.
- Replace the last `wp_get_attachment_metadata()` with `get_post_meta()`.
- For consistency only accept array or named size in `wp_get_attachment_image_sizes()`.
Props jaspermdegroot.
See #34430.
Built from https://develop.svn.wordpress.org/trunk@35491
git-svn-id: http://core.svn.wordpress.org/trunk@35455 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Check if wp_get_attachment_metadata() has returned an array to prevent errors when using SVGs.
- Only add the srcset attribute if there will be a sizes attribute.
- Better filter names.
- Some more inline docs fixes.
Props jaspermdegroot.
See #34430.
Built from https://develop.svn.wordpress.org/trunk@35419
git-svn-id: http://core.svn.wordpress.org/trunk@35383 1a063a9b-81f0-0310-95a4-ce76da25c4cd
- Introduce `wp_calculate_image_srcset()` that replaces `wp_get_attachment_image_srcset_array()` and is used as lower level function for retrieving the srcset data as array.
- Use the new function when generating `srcset` and `sizes` on the front-end. This is faster as no (other) image API functions are used.
- Change the `wp_get_attachment_image_srcset()`. Now it is meant for use in templates and is no longer used in core.
- A few logic fixes and improvements.
- Some names changed to be (hopefully) more descriptive.
- Fixed/updated tests.
Props joemcgill, jaspermdegroot, azaozz.
See #34430.
Built from https://develop.svn.wordpress.org/trunk@35412
git-svn-id: http://core.svn.wordpress.org/trunk@35376 1a063a9b-81f0-0310-95a4-ce76da25c4cd
New functions in `media.php`:
* `wp_get_attachment_image_srcset_array()` - Returns an array of image candidate string data used to build a `srcset` value for an attachment given an `$attachement_id` and `$size`.
* `wp_get_attachment_image_srcset()` - Returns the `srcset` value for an attachment given an `$attachement_id` and `$size`.
* `wp_get_attachment_image_sizes()` - Returns the `sizes` value for an attachment given an `$attachement_id` and `$size` and optional arguments used to alter its output.
* `wp_make_content_images_responsive()` - A display filter for adding `srcset` and `sizes` to images embedded in content.
* `wp_img_add_srcset_and_sizes()` - A utility function used by `wp_make_content_images_responsive()` to add `srcset` and `sizes` to a single `<img>` element.
Modifies existing core functions:
* Modify `wp_get_attachment_image()` so the HTML returned for an image includes `srcset` and `sizes`.
* Modify `get_media_embedded_in_content()` (sup, 3.6 leftover) by adding `<img>` to the list of accepted tags that can be matched in content. This is used in `wp_make_content_images_responsive()` to find all of the images embedded in content before passing them off to `wp_img_add_srcset_and_sizes()`.
Tests:
* Add a new factory method to `WP_UnitTest_Factory_For_Attachment` named `create_upload_object()`
* Adds unit tests
* Updates unit tests
Props joemcgill, tevko, jaspermdegroot, mdmcginn, barryceelen, peterwilsoncc, fsylum, wonderboymusic, chriscoyier, benjaminpick, jrfnl, #12kingkool68, janhenckens, ryanmarkel, side777, ryelle, wturrell, micahmills, mattbagwell, coliff, DrewAPicture.
See #33641.
Built from https://develop.svn.wordpress.org/trunk@34855
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If not short-circuited via the `image_downsize` boolean filter, `image_downsize()` returns an array of data including the image URL, width, height, and whether the image size is intermediate, in that order. Otherwise, it returns false.
Fixes#30636.
Built from https://develop.svn.wordpress.org/trunk@34362
git-svn-id: http://core.svn.wordpress.org/trunk@34326 1a063a9b-81f0-0310-95a4-ce76da25c4cd
