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+<!DOCTYPE html>
+<html>
+<body>
+  <h1>Introduction</h1>
+  <div>
+    <h1>About HTML</h1>
+    <h1>About CSS</h1>
+  </div>
+  <h1>About JavaScript</h1>
+
+  <script>
+    for (let parent of document.getElementsByTagName('div'))
+        for (let child of parent.children)
+            if (child.tagName == 'H1')
+                child.setAttribute('style', 'background-color: #436e58')
+  </script>
+</body>
+</html>