Ticket #56969: 56969.2.diff

src/wp-includes/media.php

@@ -1962 +1962 @@
  * @return string Converted `img` tag with `decoding` attribute added.
  */
 function wp_img_tag_add_decoding_attr( $image, $context ) {
+        // Only apply the decoding attribute to images that have a src attribute that
+        // starts with a double quote, ensuring escaped JSON is also excluded.
+        if ( false === strpos( $image, ' src="' ) ) {
+                return $image;
+        }
+
         /**
          * Filters the `decoding` attribute value to add to an image. Default `async`.
          *

tests/phpunit/tests/media.php

@@ -3162 +3162 @@
                 $this->assertStringNotContainsString( ' loading=', $img );
         }
 
+        /**
+         * Test that decoding="async" is not applied to img tags with single quotes.
+         *
+         * @ticket 56969
+         */
+        public function test_wp_img_tag_add_decoding_attr_with_single_quotes() {
+                $img = "<img src='example.png' alt='' width='300' height='225' />";
+                $img = wp_img_tag_add_decoding_attr( $img, 'test' );
+                $this->assertStringNotContainsString( ' decoding="async"', $img );
+        }
+
+        /**
+         * Test that decoding="async" is not applied to img tags inside JSON.
+         *
+         * @ticket 56969
+         */
+        public function test_decoding_async_not_applied_to_json() {
+                $content = '{"image": "<img src=\"example.png\" alt=\"\" width=\"300\" height=\"225\" />"}';
+                $content = wp_filter_content_tags( $content );
+                $this->assertStringNotContainsString( ' decoding="async"', $content );
+        }
+
         /**
          * @ticket 50756
          */