Add support for `IMG` tags with `fetchpriority=low` or `fetchpriority=auto` by westonruter · Pull Request #11196 · WordPress/wordpress-develop

westonruter · 2026-03-06T23:38:25Z

Trac ticket: https://core.trac.wordpress.org/ticket/64823

Ensure `IMG` with `fetchpriority=low` does not get lazy-loaded, increase media count, or interfere with assigning `fetchpriority=high`

With WordPress/gutenberg#76208 checked out and there are 5 large images added to a Navigation Overlay and 5 large images in the post content, given the following script being run in the console:

Array.from(document.querySelectorAll(".wp-site-blocks img")).map((img) => {
  return {
    insideNavOverlay: !!img.closest(".wp-block-navigation__overlay-container"),
    loading: img.loading,
    fetchPriority: img.fetchPriority,
  };
});

Before ❌

[
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    }
]

After ✅

[
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": true,
        "loading": "auto",
        "fetchPriority": "low"
    },
    {
        "insideNavOverlay": false,
        "loading": "auto",
        "fetchPriority": "high"
    },
    {
        "insideNavOverlay": false,
        "loading": "auto",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "auto",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    },
    {
        "insideNavOverlay": false,
        "loading": "lazy",
        "fetchPriority": "auto"
    }
]

The diff shows the changes to the first three images in the content (outside of the navigation overlay):

--- before.json	2026-03-06 15:32:18
+++ after.json	2026-03-06 15:32:27
@@ -26,17 +26,17 @@
     },
     {
         "insideNavOverlay": false,
-        "loading": "lazy",
-        "fetchPriority": "auto"
+        "loading": "auto",
+        "fetchPriority": "high"
     },
     {
         "insideNavOverlay": false,
-        "loading": "lazy",
+        "loading": "auto",
         "fetchPriority": "auto"
     },
     {
         "insideNavOverlay": false,
-        "loading": "lazy",
+        "loading": "auto",
         "fetchPriority": "auto"
     },
     {

Fixes:

Preserve fetchpriority=high being assigned to the first large image outside of the Navigation Overlay.
Prevent adding loading=lazy on the first three images in the content.

Add support for `fetchpriority=auto`

This also improves handling of IMG tags with fetchpriority=auto, as is proposed solution to prevent viewport-conditional Image blocks from getting fetchpriority=high applied. See:

Block Visibility: Add fetchpriority=auto to IMG tags in blocks with conditional viewport visibility to prevent potential erroneous high loading priority gutenberg#76302

(This wordpress-develop PR is a backport PR for that Gutenberg PR.)

Nevertheless, that PR alone does exclude images with fetchpriority=auto from contributing to the overall media count. This means you can have 3 images which are conditionally displayed in mobile, tablet, and desktop, respectively, and then the fourth image is rendered with loading=lazy when in reality it is only the second image actually displayed.

Example Post Content

<!-- wp:image {"id":38,"sizeSlug":"large","linkDestination":"none","metadata":{"blockVisibility":{"viewport":{"desktop":false,"tablet":false}},"name":"Mobile image"}} -->
<figure class="wp-block-image size-large"><img src="http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1024x741.jpg" alt="Mobile" class="wp-image-38"/></figure>
<!-- /wp:image -->

<!-- wp:image {"id":37,"sizeSlug":"large","linkDestination":"none","metadata":{"blockVisibility":{"viewport":{"desktop":false,"mobile":false}},"name":"Tablet image"}} -->
<figure class="wp-block-image size-large"><img src="http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1024x683.jpg" alt="Tablet" class="wp-image-37"/></figure>
<!-- /wp:image -->

<!-- wp:image {"id":36,"sizeSlug":"large","linkDestination":"none","metadata":{"blockVisibility":{"viewport":{"tablet":false,"mobile":false}},"name":"Desktop image"}} -->
<figure class="wp-block-image size-large"><img src="http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1024x668.jpg" alt="Desktop" class="wp-image-36"/></figure>
<!-- /wp:image -->

<!-- wp:image {"id":430,"sizeSlug":"large","linkDestination":"none"} -->
<figure class="wp-block-image size-large"><img src="http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1024x771.jpg" alt="" class="wp-image-430"/></figure>
<!-- /wp:image -->

Before ❌

<div
  class="entry-content alignfull wp-block-post-content has-global-padding is-layout-constrained wp-block-post-content-is-layout-constrained"
>
  <figure
    class="wp-block-image size-large wp-block-hidden-desktop wp-block-hidden-tablet"
  >
    <img
      decoding="async"
      width="1024"
      height="741"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1024x741.jpg"
      alt="Mobile"
      class="wp-image-38"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1024x741.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-300x217.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-768x556.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1536x1112.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-2048x1483.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure
    class="wp-block-image size-large wp-block-hidden-desktop wp-block-hidden-mobile"
  >
    <img
      decoding="async"
      width="1024"
      height="683"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1024x683.jpg"
      alt="Tablet"
      class="wp-image-37"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1024x683.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-300x200.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-768x512.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1536x1025.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-2048x1366.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure
    class="wp-block-image size-large wp-block-hidden-mobile wp-block-hidden-tablet"
  >
    <img
      decoding="async"
      width="1024"
      height="668"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1024x668.jpg"
      alt="Desktop"
      class="wp-image-36"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1024x668.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-300x196.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-768x501.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1536x1002.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-2048x1336.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure class="wp-block-image size-large">
    <img
      loading="lazy"
      decoding="async"
      width="1024"
      height="771"
      src="http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1024x771.jpg"
      alt=""
      class="wp-image-430"
      srcset="
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1024x771.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-300x226.jpg    300w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-768x578.jpg    768w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1536x1157.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-2048x1542.jpg 2048w
      "
      sizes="auto, (max-width: 1024px) 100vw, 1024px"
    />
  </figure>
</div>

After ✅

<div
  class="entry-content alignfull wp-block-post-content has-global-padding is-layout-constrained wp-block-post-content-is-layout-constrained"
>
  <figure
    class="wp-block-image size-large wp-block-hidden-desktop wp-block-hidden-tablet"
  >
    <img
      decoding="async"
      width="1024"
      height="741"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1024x741.jpg"
      alt="Mobile"
      class="wp-image-38"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1024x741.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-300x217.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-768x556.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-1536x1112.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_bison_Wichita_Mountain_Oklahoma-2048x1483.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure
    class="wp-block-image size-large wp-block-hidden-desktop wp-block-hidden-mobile"
  >
    <img
      decoding="async"
      width="1024"
      height="683"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1024x683.jpg"
      alt="Tablet"
      class="wp-image-37"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1024x683.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-300x200.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-768x512.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-1536x1025.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/Bison_with_its_young-2560w-2048x1366.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure
    class="wp-block-image size-large wp-block-hidden-mobile wp-block-hidden-tablet"
  >
    <img
      decoding="async"
      width="1024"
      height="668"
      fetchpriority="auto"
      src="http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1024x668.jpg"
      alt="Desktop"
      class="wp-image-36"
      srcset="
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1024x668.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-300x196.jpg    300w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-768x501.jpg    768w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-1536x1002.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2025/11/American_bison_k5680-1-2048x1336.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>

  <figure class="wp-block-image size-large">
    <img
      decoding="async"
      width="1024"
      height="771"
      src="http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1024x771.jpg"
      alt=""
      class="wp-image-430"
      srcset="
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1024x771.jpg  1024w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-300x226.jpg    300w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-768x578.jpg    768w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1536x1157.jpg 1536w,
        http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-2048x1542.jpg 2048w
      "
      sizes="(max-width: 1024px) 100vw, 1024px"
    />
  </figure>
</div>

--- before.html	2026-03-08 19:17:32
+++ after.html	2026-03-08 19:18:07
@@ -69,7 +69,6 @@
 
   <figure class="wp-block-image size-large">
     <img
-      loading="lazy"
       decoding="async"
       width="1024"
       height="771"
@@ -83,7 +82,7 @@
         http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-1536x1157.jpg 1536w,
         http://localhost:8000/wp-content/uploads/2026/03/PXL_20260125_215136959-2048x1542.jpg 2048w
       "
-      sizes="auto, (max-width: 1024px) 100vw, 1024px"
+      sizes="(max-width: 1024px) 100vw, 1024px"
     />
   </figure>
 </div>

Use of AI Tools

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

…e media count

github-actions · 2026-03-06T23:40:13Z

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core Committers: Use this line as a base for the props when committing in SVN:

Props westonruter, mukesh27.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

github-actions · 2026-03-06T23:48:54Z

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westonruter · 2026-03-07T01:34:25Z

cc @mukeshpanchal27

Copilot

Pull request overview

Updates core loading-optimization heuristics to treat img[fetchpriority=low] as a special case so it won’t be lazy-loaded, won’t affect the content media count, and won’t interfere with assigning fetchpriority=high to the first in-viewport large image.

Changes:

Extend wp_get_loading_optimization_attributes() to recognize existing fetchpriority=low and avoid adding loading="lazy" / incrementing media count.
Add PHPUnit coverage to ensure fetchpriority=low images don’t influence the “first N images not lazy-loaded” and high-priority selection logic.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
`src/wp-includes/media.php`	Adds `fetchpriority=low` handling in loading optimization logic and documents the behavior.
`tests/phpunit/tests/media.php`	Adds helper + additional assertions to cover `fetchpriority=low` interactions across contexts/loops.

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src/wp-includes/media.php

tests/phpunit/tests/media.php

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

tests/phpunit/tests/media.php

src/wp-includes/media.php

Co-authored-by: Mukesh Panchal <mukeshpanchal27@users.noreply.github.com>

…ority low/auto

…riority=auto

…tr()

westonruter · 2026-03-09T02:31:46Z

@mukeshpanchal27 I've expanded the scope here to include the closely related changes for block visibility described in WordPress/gutenberg#76301.

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tests/phpunit/tests/media.php

src/wp-includes/block-supports/block-visibility.php

src/wp-includes/media.php

tests/phpunit/tests/media.php

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westonruter · 2026-03-09T03:08:44Z

src/wp-includes/html-api/class-wp-html-tag-processor.php

 	 * }
 	 * @return bool Whether a tag was matched.
+	 *
+	 * @phpstan-impure


See https://phpstan.org/writing-php-code/phpdocs-basics#impure-functions

This is needed so that $processor->next_tag() isn't flagged by PHPStan in the above.

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src/wp-includes/block-supports/block-visibility.php

westonruter · 2026-03-09T04:17:59Z

src/wp-includes/block-supports/block-visibility.php

+				/*
+				 * Set all IMG tags to be `fetchpriority=auto` so that wp_get_loading_optimization_attributes() won't add
+				 * `fetchpriority=high` or increment the media count to effect whether subsequent IMG tags get `loading=lazy`.
+				 */
+				do {
+					if ( 'IMG' === $processor->get_tag() ) {
+						$processor->set_attribute( 'fetchpriority', 'auto' );
+					}
+				} while ( $processor->next_tag() );


This is a backport from WordPress/gutenberg#76302

This function is for “block visibility” support, but it’s now also altering image-loading heuristics globally for any image inside the block. That may be intended, but it’s something that it extend the scope of this function. In future we need to check better place for it. WDYT?

This is the context in which we know that an IMG will be conditionally displayed based on the viewport size. There isn't any other code I'm aware of where PHP is aware of such styles being applied. So I don't think there is currently another spot.

For visibility: this change was approved in the the corresponding Gutenberg PR by @t-hamano and @ramonjd.

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…on-attributes

…crementing media count for them

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tests/phpunit/tests/media.php

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…ess-develop#11196

…cks (#76336) * Add fetchpriority=low to IMG tags in collapsed Accordion Item blocks * Remove removal of loading attribute since handled by WordPress/wordpress-develop#11196 Co-authored-by: westonruter <westonruter@git.wordpress.org> Co-authored-by: t-hamano <wildworks@git.wordpress.org> Co-authored-by: im3dabasia <im3dabasia1@git.wordpress.org>

…cks (#76336) * Add fetchpriority=low to IMG tags in collapsed Accordion Item blocks * Remove removal of loading attribute since handled by WordPress/wordpress-develop#11196 Co-authored-by: westonruter <westonruter@git.wordpress.org> Co-authored-by: t-hamano <wildworks@git.wordpress.org> Co-authored-by: im3dabasia <im3dabasia1@git.wordpress.org> Source: WordPress/gutenberg@50a3fc5

…cks (#76336) * Add fetchpriority=low to IMG tags in collapsed Accordion Item blocks * Remove removal of loading attribute since handled by WordPress/wordpress-develop#11196 Co-authored-by: westonruter <westonruter@git.wordpress.org> Co-authored-by: t-hamano <wildworks@git.wordpress.org> Co-authored-by: im3dabasia <im3dabasia1@git.wordpress.org> Source: WordPress/gutenberg@947d78a

mukeshpanchal27

Ready to ship 🎉

Ensure IMG with fetchpriority=low does not get lazy-loaded or increas…

e35dd28

…e media count

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westonruter and others added 3 commits March 6, 2026 17:59

Improve comment grammar/clarity

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Fix typo in comment

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mukeshpanchal27 reviewed Mar 7, 2026

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westonruter and others added 2 commits March 6, 2026 21:26

Use single quotes

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Re-use condition

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westonruter requested a review from mukeshpanchal27 March 8, 2026 21:58

westonruter added 6 commits March 8, 2026 16:32

Add phpdoc params

2093108

Correct return description for wp_high_priority_element_flag()

f5de5b2

Add missing return type for wp_high_priority_element_flag()

edf76eb

Update wp_maybe_add_fetchpriority_high_attr() to account for fetchpri…

ec3c508

…ority low/auto

Update wp_get_loading_optimization_attributes() to account for fetchp…

1439f77

…riority=auto

Fix fetchpriority attr handling in wp_maybe_add_fetchpriority_high_at…

e32f008

…tr()

westonruter changed the title ~~Ensure IMG with fetchpriority=low does not get lazy-loaded, increase media count, or interfere with assigning fetchpriority=high~~ Add support for IMG tags with fetchpriority=low or fetchpriority=auto Mar 9, 2026

westonruter mentioned this pull request Mar 9, 2026

Block Visibility: Add fetchpriority=auto to IMG tags in blocks with conditional viewport visibility to prevent potential erroneous high loading priority WordPress/gutenberg#76302

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Backport WordPress/gutenberg#76302

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westonruter and others added 2 commits March 8, 2026 19:53

Improve since description

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Fix typo in phpdoc

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westonruter and others added 6 commits March 8, 2026 20:50

Leverage assertEqualHTML in tests and add IMG to more test cases

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Apply static analysis fixes to Tests_Block_Supports_Block_Visibility

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Fix method reference

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westonruter force-pushed the trac-64823-fetchpriority-loading-optimization-attributes branch from 33b17a5 to dcf1ecb Compare March 9, 2026 04:05

Fix typo in test_wp_loading_optimization_force_header_contexts_filter

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Use affect instead of effect

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westonruter requested a review from t-hamano March 9, 2026 18:25

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PHP backports for WP 7.0 WordPress/gutenberg#74043

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westonruter added 2 commits March 9, 2026 17:23

Merge branch 'trunk' into trac-64823-fetchpriority-loading-optimizati…

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…on-attributes

Avoid treating fetchpriority=auto as maybe_in_viewport and prevent in…

86909e1

…crementing media count for them

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Fix typo in assertion message

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Replicate assertion in companion test

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westonruter added a commit to WordPress/gutenberg that referenced this pull request Mar 10, 2026

Remove removal of loading attribute since handled by WordPress/wordpr…

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…ess-develop#11196

westonruter mentioned this pull request Mar 10, 2026

Image in collapsed Accordion block may erroneously get fetchpriority=high even though hidden WordPress/gutenberg#76335

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Ensure IMG with fetchpriority=low does not get lazy-loaded, increase media count, or interfere with assigning fetchpriority=high

Add support for fetchpriority=auto

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Test using WordPress Playground

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westonruter commented Mar 6, 2026 •

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Ensure `IMG` with `fetchpriority=low` does not get lazy-loaded, increase media count, or interfere with assigning `fetchpriority=high`

Add support for `fetchpriority=auto`

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