Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body style="background:#f3f3f3 url('w3css.gif') no-repeat fixed;">

<h1>Hello World!</h1>

<p>The background-image is fixed.</p>
<p>The background-image is fixed.</p>
<p>The background-image is fixed.</p>
<p>The background-image is fixed.</p>
<p>The background-image is fixed.</p>
<p>The background-image is fixed.</p>

<button onclick="myFunction()">Get background-attachment value</button>

<script>
function myFunction() {
    alert(document.body.style.backgroundAttachment);
}
</script>

</body>
</html>