Add fetchpriority=low to IMG tags in collapsed Accordion Item blocks (#76336)

westonruter · westonruter · commit da82b2ebc7bf · 2026-03-10T17:10:37.000+11:00
* 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
diff --git a/README.md b/README.md
@@ -5,12 +5,12 @@ This is a duplicate of the [WordPress/Gutenberg](https://github.com/WordPress/gu
 You are currently viewing the version build from the source:
 
 * Branch: `wp/7.0`
-* Commit: [WordPress/Gutenberg@`b9de6ed278b`](https://github.com/WordPress/gutenberg/commit/b9de6ed278b5eafd2f3f2fb0e72221dbddd0dd03), [Browse files](https://github.com/WordPress/gutenberg/tree/b9de6ed278b5eafd2f3f2fb0e72221dbddd0dd03)
+* Commit: [WordPress/Gutenberg@`947d78aa261`](https://github.com/WordPress/gutenberg/commit/947d78aa2619458ad5223d92e2b0480fc42821d9), [Browse files](https://github.com/WordPress/gutenberg/tree/947d78aa2619458ad5223d92e2b0480fc42821d9)
 
 > [!NOTE]
 > This readme file has replaced the original version included in the upstream repository.
 >
-> The [original `README.md` file](https://github.com/WordPress/gutenberg/blob/b9de6ed278b5eafd2f3f2fb0e72221dbddd0dd03/README.md) file for this commit can be found in the upstream repository.
+> The [original `README.md` file](https://github.com/WordPress/gutenberg/blob/947d78aa2619458ad5223d92e2b0480fc42821d9/README.md) file for this commit can be found in the upstream repository.
 
 ## Pupose
 
diff --git a/build/scripts/block-library/accordion-item.php b/build/scripts/block-library/accordion-item.php
@@ -6,13 +6,12 @@
  * @package WordPress
  * @since 6.9.0
  *
- * @param array $attributes The block attributes.
- * @param string $content The block content.
- *
+ * @param array{ openByDefault: bool } $attributes The block attributes.
+ * @param string                        $content   The block content.
  * @return string Returns the updated markup.
  */
-function gutenberg_block_core_accordion_item_render( $attributes, $content ) {
-	if ( ! $content ) {
+function gutenberg_block_core_accordion_item_render( array $attributes, string $content ): string {
+	if ( '' === $content ) {
 		return $content;
 	}
 
@@ -56,6 +55,19 @@ function gutenberg_block_core_accordion_item_render( $attributes, $content ) {
 		}
 	}
 
+	/*
+	 * If an Accordion Item is collapsed by default, ensure any contained IMG has fetchpriority=low to deprioritize it
+	 * from contending with resources in the critical rendering path. In contrast, remove the loading attribute to
+	 * prevent the image from not being available when the item is expanded.
+	 */
+	if ( ! $attributes['openByDefault'] ) {
+		$processor = new WP_HTML_Tag_Processor( $content );
+		while ( $processor->next_tag( 'IMG' ) ) {
+			$processor->set_attribute( 'fetchpriority', 'low' );
+		}
+		$content = $processor->get_updated_html();
+	}
+
 	return $content;
 }
 
