محرر ويب أونلاين

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<!DOCTYPE html>
<html>
    <head>
        <style>
p {
    margin: 0;
    border: 1px solid gray;
}
        </style>
    </head>
    <body>
        <h2>CSS margin shorthand</h2>
        <p>This element has no margin.</p>
        <p>This element has no margin.</p>
    </body>
</html>