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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Demo</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
<style>
dialog {
    position: relative;
    border: 1px solid black; /* Default is 2px. */
}
dialog::backdrop {
    background-color: salmon;
}
#closeButton {
    font-size: 1.5em;
    line-height: .75em;
    position: absolute;
    right: 0;
    top: 0;
    border-left: 1px solid black;
    border-bottom: 1px solid black;
    padding: 3px;
}
#closeButton:hover {
    cursor: pointer;
    background-color: black;
    color: white;
}
</style>
</head>
<body>
    <dialog>
        <div id="closeButton" onclick="this.parentNode.close()">×</div>
        <p>This is a dialog box.</p>
    </dialog>

<script>
    document.getElementsByTagName('dialog')[0].showModal(); // Or show() for a non-modal display.
</script>
</body>
</html>
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