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<title>[59415] trunk: Media: Avoid images with `sizes=auto` to be displayed downsized in supporting browsers.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/59415">59415</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/59415","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>flixos90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-11-18 19:50:06 +0000 (Mon, 18 Nov 2024)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Media: Avoid images with `sizes=auto` to be displayed downsized in supporting browsers.

Based on the user agent stylesheet rules outlined in https://html.spec.whatwg.org/multipage/rendering.html#img-contain-size, images that have `sizes=auto` while applying `width: auto` or `width: fit-content` would be constrained to only 300px width.

This changeset overrides said user agent stylesheet rule with a much larger constraint, to avoid the problem.

Additionally, it introduces a filter `wp_img_tag_add_auto_sizes` which can be used to opt out of the functionality, as an additional measure.

Props joemcgill, flixos90, dooperweb, SirLouen, azaozz, mukesh27, apermo.
Fixes <a href="https://core.trac.wordpress.org/ticket/62413">#62413</a>.
See <a href="https://core.trac.wordpress.org/ticket/61847">#61847</a>, <a href="https://core.trac.wordpress.org/ticket/62345">#62345</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesdefaultfiltersphp">trunk/src/wp-includes/default-filters.php</a></li>
<li><a href="#trunksrcwpincludesmediaphp">trunk/src/wp-includes/media.php</a></li>
<li><a href="#trunktestsphpunittestsmediaphp">trunk/tests/phpunit/tests/media.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesdefaultfiltersphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/default-filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/default-filters.php 2024-11-18 19:31:45 UTC (rev 59414)
+++ trunk/src/wp-includes/default-filters.php   2024-11-18 19:50:06 UTC (rev 59415)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -611,6 +611,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'wp_default_styles', 'wp_default_styles' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_filter( 'style_loader_src', 'wp_style_loader_src', 10, 2 );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+add_action( 'wp_head', 'wp_print_auto_sizes_contain_css_fix', 1 );
</ins><span class="cx" style="display: block; padding: 0 10px"> add_action( 'wp_head', 'wp_maybe_inline_styles', 1 ); // Run for styles enqueued in <head>.
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'wp_footer', 'wp_maybe_inline_styles', 1 ); // Run for late-loaded styles in the footer.
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunksrcwpincludesmediaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/media.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/media.php   2024-11-18 19:31:45 UTC (rev 59414)
+++ trunk/src/wp-includes/media.php     2024-11-18 19:50:06 UTC (rev 59415)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1137,8 +1137,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                /** This filter is documented in wp-includes/media.php */
+               $add_auto_sizes = apply_filters( 'wp_img_tag_add_auto_sizes', true );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Adds 'auto' to the sizes attribute if applicable.
</span><span class="cx" style="display: block; padding: 0 10px">                if (
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        $add_auto_sizes &&
</ins><span class="cx" style="display: block; padding: 0 10px">                         isset( $attr['loading'] ) &&
</span><span class="cx" style="display: block; padding: 0 10px">                        'lazy' === $attr['loading'] &&
</span><span class="cx" style="display: block; padding: 0 10px">                        isset( $attr['sizes'] ) &&
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1985,6 +1989,17 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * @return string The filtered image tag markup.
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_img_tag_add_auto_sizes( string $image ): string {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * Filters whether auto-sizes for lazy loaded images is enabled.
+        *
+        * @since 6.7.1
+        *
+        * @param boolean $enabled Whether auto-sizes for lazy loaded images is enabled.
+        */
+       if ( ! apply_filters( 'wp_img_tag_add_auto_sizes', true ) ) {
+               return $image;
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         $processor = new WP_HTML_Tag_Processor( $image );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Bail if there is no IMG tag.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1993,11 +2008,22 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Bail early if the image is not lazy-loaded.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $value = $processor->get_attribute( 'loading' );
-       if ( ! is_string( $value ) || 'lazy' !== strtolower( trim( $value, " \t\f\r\n" ) ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $loading = $processor->get_attribute( 'loading' );
+       if ( ! is_string( $loading ) || 'lazy' !== strtolower( trim( $loading, " \t\f\r\n" ) ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                 return $image;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /*
+        * Bail early if the image doesn't have a width attribute.
+        * Per WordPress Core itself, lazy-loaded images should always have a width attribute.
+        * However, it is possible that lazy-loading could be added by a plugin, where we don't have that guarantee.
+        * As such, it still makes sense to ensure presence of a width attribute here in order to use `sizes=auto`.
+        */
+       $width = $processor->get_attribute( 'width' );
+       if ( ! is_string( $width ) || '' === $width ) {
+               return $image;
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         $sizes = $processor->get_attribute( 'sizes' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Bail early if the image is not responsive.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2030,6 +2056,28 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Prints a CSS rule to fix potential visual issues with images using `sizes=auto`.
+ *
+ * This rule overrides the similar rule in the default user agent stylesheet, to avoid images that use e.g.
+ * `width: auto` or `width: fit-content` to appear smaller.
+ *
+ * @since 6.7.1
+ * @see https://html.spec.whatwg.org/multipage/rendering.html#img-contain-size
+ * @see https://core.trac.wordpress.org/ticket/62413
+ */
+function wp_print_auto_sizes_contain_css_fix() {
+       /** This filter is documented in wp-includes/media.php */
+       $add_auto_sizes = apply_filters( 'wp_img_tag_add_auto_sizes', true );
+       if ( ! $add_auto_sizes ) {
+               return;
+       }
+
+       ?>
+       <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style>
+       <?php
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px">  * Adds optimization attributes to an `img` HTML tag.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 6.3.0
</span></span></pre></div>
<a id="trunktestsphpunittestsmediaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/media.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/media.php       2024-11-18 19:31:45 UTC (rev 59414)
+++ trunk/tests/phpunit/tests/media.php 2024-11-18 19:50:06 UTC (rev 59415)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -6201,6 +6201,36 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Test generated markup for an image with no width does not get auto-sizes.
+        *
+        * @ticket 61847
+        * @ticket 62413
+        */
+       public function test_image_without_width_does_not_have_auto_sizes() {
+               // Disable automatic width calculation.
+               add_filter(
+                       'wp_get_attachment_image_src',
+                       function ( $img_data ) {
+                               return array( $img_data[0], null, null );
+                       }
+               );
+
+               $markup = wp_get_attachment_image( self::$large_id, 'large', false, array( 'loading' => false ) );
+
+               $this->assertStringNotContainsString(
+                       'width="',
+                       $markup,
+                       'Failed confirming the test markup did not include a width attribute.'
+               );
+
+               $this->assertStringNotContainsString(
+                       'sizes="auto, ',
+                       $markup,
+                       'Failed asserting that the sizes attribute for an image without a width does not include "auto".'
+               );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Test content filtered markup with lazy loading gets auto-sizes.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 61847
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -6237,6 +6267,46 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Test content filtered markup with lazy loading does not get auto-sizes when disabled.
+        *
+        * @ticket 61847
+        * @ticket 62413
+        *
+        * @covers ::wp_img_tag_add_auto_sizes
+        */
+       public function test_content_image_does_not_have_auto_sizes_when_disabled() {
+               // Force lazy loading attribute.
+               add_filter( 'wp_img_tag_add_loading_attr', '__return_true' );
+               // Disable auto-sizes attribute.
+               add_filter( 'wp_img_tag_add_auto_sizes', '__return_false' );
+
+               $this->assertStringNotContainsString(
+                       'sizes="auto, ',
+                       wp_filter_content_tags( get_image_tag( self::$large_id, '', '', '', 'large' ) ),
+                       'Failed asserting that the sizes attribute for a content image with lazy loading does not include "auto" when disabled.'
+               );
+       }
+
+       /**
+        * Test generated image markup with lazy loading does not get auto-sizes when disabled.
+        *
+        * @ticket 61847
+        * @ticket 62413
+        *
+        * @covers ::wp_img_tag_add_auto_sizes
+        */
+       public function test_generated_image_does_not_have_auto_sizes_when_disabled() {
+               // Disable auto-sizes attribute.
+               add_filter( 'wp_img_tag_add_auto_sizes', '__return_false' );
+
+               $this->assertStringNotContainsString(
+                       'sizes="auto, ',
+                       wp_get_attachment_image( self::$large_id, 'large', false, array( 'loading' => 'lazy' ) ),
+                       'Failed asserting that the sizes attribute for an image with lazy loading does not include "auto" when disabled.'
+               );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Test generated markup for an image with 'auto' keyword already present in sizes does not receive it again.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 61847
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -6385,45 +6455,49 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public function data_provider_to_test_wp_img_tag_add_auto_sizes() {
</span><span class="cx" style="display: block; padding: 0 10px">                return array(
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_with_single_quoted_attributes'       => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => "<img src='https://example.com/foo-300x225.jpg' srcset='https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w' sizes='(max-width: 650px) 100vw, 650px' loading='lazy'>",
-                               'expected' => "<img src='https://example.com/foo-300x225.jpg' srcset='https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w' sizes=\"auto, (max-width: 650px) 100vw, 650px\" loading='lazy'>",
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => "<img width='300' height='225' src='https://example.com/foo-300x225.jpg' srcset='https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w' sizes='(max-width: 650px) 100vw, 650px' loading='lazy'>",
+                               'expected' => "<img width='300' height='225' src='https://example.com/foo-300x225.jpg' srcset='https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w' sizes=\"auto, (max-width: 650px) 100vw, 650px\" loading='lazy'>",
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_with_data_sizes_attribute'           => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading="lazy">',
-                               'expected' => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading="lazy">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading="lazy">',
+                               'expected' => '<img width="300" height="225" data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading="lazy">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_with_data_sizes_attribute_already_present' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="AUTO, (max-width: 650px) 100vw, 650px" loading="lazy">',
-                               'expected' => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="AUTO, (max-width: 650px) 100vw, 650px" loading="lazy">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="AUTO, (max-width: 650px) 100vw, 650px" loading="lazy">',
+                               'expected' => '<img width="300" height="225" data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="AUTO, (max-width: 650px) 100vw, 650px" loading="lazy">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'not_expected_with_loading_lazy_in_attr_value' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" alt=\'This is the LCP image and it should not get loading="lazy"!\'>',
-                               'expected' => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" alt=\'This is the LCP image and it should not get loading="lazy"!\'>',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" alt=\'This is the LCP image and it should not get loading="lazy"!\'>',
+                               'expected' => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" alt=\'This is the LCP image and it should not get loading="lazy"!\'>',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'not_expected_with_data_loading_attribute_present' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" data-removed-loading="lazy">',
-                               'expected' => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" data-removed-loading="lazy">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" data-removed-loading="lazy">',
+                               'expected' => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" data-removed-loading="lazy">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_when_attributes_have_spaces_after_them' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src = "https://example.com/foo-300x225.jpg" srcset = "https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes = "(max-width: 650px) 100vw, 650px" loading = "lazy">',
-                               'expected' => '<img src = "https://example.com/foo-300x225.jpg" srcset = "https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading = "lazy">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src = "https://example.com/foo-300x225.jpg" srcset = "https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes = "(max-width: 650px) 100vw, 650px" loading = "lazy">',
+                               'expected' => '<img width="300" height="225" src = "https://example.com/foo-300x225.jpg" srcset = "https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading = "lazy">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_when_attributes_are_upper_case'      => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<IMG SRC="https://example.com/foo-300x225.jpg" SRCSET="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" SIZES="(max-width: 650px) 100vw, 650px" LOADING="LAZY">',
-                               'expected' => '<IMG SRC="https://example.com/foo-300x225.jpg" SRCSET="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" LOADING="LAZY">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<IMG WIDTH="300" HEIGHT="225" SRC="https://example.com/foo-300x225.jpg" SRCSET="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" SIZES="(max-width: 650px) 100vw, 650px" LOADING="LAZY">',
+                               'expected' => '<IMG WIDTH="300" HEIGHT="225" SRC="https://example.com/foo-300x225.jpg" SRCSET="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" LOADING="LAZY">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_when_loading_lazy_lacks_quotes'      => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading=lazy>',
-                               'expected' => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading=lazy>',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading=lazy>',
+                               'expected' => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading=lazy>',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'expected_when_loading_lazy_has_whitespace'    => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading=" lazy ">',
-                               'expected' => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading=" lazy ">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading=" lazy ">',
+                               'expected' => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="auto, (max-width: 650px) 100vw, 650px" loading=" lazy ">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'not_expected_when_sizes_auto_lacks_quotes'    => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'input'    => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes=auto loading="lazy">',
-                               'expected' => '<img src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes=auto loading="lazy">',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'input'    => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes=auto loading="lazy">',
+                               'expected' => '<img width="300" height="225" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes=auto loading="lazy">',
</ins><span class="cx" style="display: block; padding: 0 10px">                         ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'not_expected_when_img_lacks_dimensions'       => array(
+                               'input'    => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading="lazy">',
+                               'expected' => '<img data-tshirt-sizes="S M L" src="https://example.com/foo-300x225.jpg" srcset="https://example.com/foo-300x225.jpg 300w, https://example.com/foo-1024x768.jpg 1024w, https://example.com/foo-768x576.jpg 768w, https://example.com/foo-1536x1152.jpg 1536w, https://example.com/foo-2048x1536.jpg 2048w" sizes="(max-width: 650px) 100vw, 650px" loading="lazy">',
+                       ),
</ins><span class="cx" style="display: block; padding: 0 10px">                 );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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