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chromium/third_party/blink/web_tests/html/marquee/marquee-should-not-wrap.html 

<body>
<script src="../../resources/js-test.js"></script>
<marquee width="10px" height="300px" behavior="slide" scrolldelay="1" treespeed=true>
This text should not wrap.
</marquee>
<script>
var jsTestIsAsync = true;
setTimeout(function() {
    finishJSTest();
}, 600);
</script>
</body>