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document.getElementById('elementId').style.display = "none";
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<!DOCTYPE html>
<html>
<body>
<h2>What Can JavaScript Do?</h2>
<p id="demo">JavaScript can hide HTML elements.</p>
<button type="button" onclick="document.getElementById('demo').style.display='none'">Click Me!</button>
</body>
</html>
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<!DOCTYPE html>
<html>
<body>
<!-- This is a comment -->
<p>This is a paragraph.</p>
<!-- Comments are not displayed in the browser -->
</body>
</html>
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<!DOCTYPE html>
<html>
<body>
<h2>What Can JavaScript Do?</h2>
<p id="demo">JavaScript can hide HTML elements.</p>
<button type="button" onclick="document.getElementById('demo').style.display='none'">Click Me!</button>
</body>
</html>
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