How to hide code in html

How hide in html

#elementID{
display:none;
}

How to hide code in html

<!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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Apit teks Selamat Datang di Progate dengan tag <h1>.
Html