محرر ويب أونلاين

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<!DOCTYPE html>
<html>
    <head>
        <style>
h1 {
    visibility: hidden;
}
        </style>
    </head>
    <body>
        <h1>Visibility hidden</h1>
        <p>H1 is hidden but its place is reserved.</p>
    </body>
</html>