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<html><body><h1 id="id1">My Heading 1</h1><button type="button" onclick="document.getElementById('id1').style.color = 'red'">Click Me!</button></body></html><html><body><h1 id="id1">My Heading 1</h1><button type="button" onclick="document.getElementById('id1').style.color = 'red'">Click Me!</button></body></html>