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Test Info:

<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Test pref for overscroll-behavior property</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
</head>
<script class="testbody" type="text/javascript">
function runTest() {
let css = "div { overscroll-behavior: auto; }";
let style = document.createElement('style');
style.appendChild(document.createTextNode(css));
document.head.appendChild(style);
is(document.styleSheets[0].cssRules[0].style.length,
0,
"overscroll-behavior shouldn't be parsed if the pref is off");
SimpleTest.finish();
}
SpecialPowers.pushPrefEnv({ set: [["layout.css.overscroll-behavior.enabled", false]] },
runTest);
SimpleTest.waitForExplicitFinish();
</script>
</html>