Update OptimizeHeroImages::generateImg() to auto SSR high fetchprio…

…rity img

src/Optimizer/Transformer/OptimizeHeroImages.php

@@ -113,6 +113,13 @@ final class OptimizeHeroImages implements Transformer
      */
     const NOSCRIPT_IMG_XPATH_QUERY = './noscript/img';
 
+    /**
+     * XPath query to relatively fetch all noscript > img[fetchpriority="high"] elements.
+     *
+     * @var string
+     */
+    const NOSCRIPT_IMG_FETCHPRIORITY_HIGH_XPATH_QUERY = './noscript/img[@fetchpriority="high"]';
+
     /**
      * Regular expression pattern to extract the URL from a CSS background-image property.
      *
@@ -215,6 +222,17 @@ private function findHeroImages(Document $document, $maxHeroImageCount)
                 $seenParagraphCount++;
             }
 
+            if ($node->tagName === Extension::IMG && ! $node->hasAttribute(Attribute::DATA_HERO)) {
+                $highFetchpriorityImage = $document->xpath->query(
+                    self::NOSCRIPT_IMG_FETCHPRIORITY_HIGH_XPATH_QUERY,
+                    $node
+                )->item(0);
+
+                if ($highFetchpriorityImage instanceof Element) {
+                    $node->setAttribute(Attribute::DATA_HERO, '');
+                }
+            }
+
             $heroImage = $this->detectImageWithAttribute($node, Attribute::DATA_HERO);
             if ($heroImage) {
                 $heroImages[] = $heroImage;