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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>
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