LayoutTests/fast/html/marquee-scroll.html - WebKit - Git at Google

 <html>
 <title>Test for marquee scrolling behavior</title>
 <script>
     if (window.testRunner)
         testRunner.waitUntilDone();

     function waitForMarquee()
     {
         var counter = 0;
         var marqueeWidth = document.getElementById('marquee').offsetWidth;
         var numSteps = 1 + marqueeWidth / 6; // Default scrollAmount is 6px

         var interval = window.setInterval(function() {
             if (++counter >= numSteps) {
                 window.clearInterval(interval);
                 if (window.testRunner)
                     testRunner.notifyDone();
             }
         }, 16);
     }
     window.addEventListener('load', waitForMarquee, false);
 </script>
 <body>

 <p>Test for <a href="http://bugs.webkit.org/show_bug.cgi?id=15263">bug 15263</a>:
 REGRESSION: scrolldelay=0 causes marquee not to display</p>

 <p>The marquee below is defined with a scrollDelay value of zero and with the truespeed attribute assigned to an empty string.  It should scroll until the text, &quot;The marquee scroll test passed&quot; is visible and left justified.</p>

 <marquee id="marquee" width="300px" behavior="slide" bgcolor="cyan" truespeed="" scrollDelay="0">
 The marquee scroll test passed
 </marquee>

 </body>
 </html>
	<html>
	<title>Test for marquee scrolling behavior</title>
	<script>
	if (window.testRunner)
	testRunner.waitUntilDone();

	function waitForMarquee()
	{
	var counter = 0;
	var marqueeWidth = document.getElementById('marquee').offsetWidth;
	var numSteps = 1 + marqueeWidth / 6; // Default scrollAmount is 6px

	var interval = window.setInterval(function() {
	if (++counter >= numSteps) {
	window.clearInterval(interval);
	if (window.testRunner)
	testRunner.notifyDone();
	}
	}, 16);
	}
	window.addEventListener('load', waitForMarquee, false);
	</script>
	<body>

	<p>Test for <a href="http://bugs.webkit.org/show_bug.cgi?id=15263">bug 15263</a>:
	REGRESSION: scrolldelay=0 causes marquee not to display</p>

	<p>The marquee below is defined with a scrollDelay value of zero and with the truespeed attribute assigned to an empty string. It should scroll until the text, "The marquee scroll test passed" is visible and left justified.</p>

	<marquee id="marquee" width="300px" behavior="slide" bgcolor="cyan" truespeed="" scrollDelay="0">
	The marquee scroll test passed
	</marquee>

	</body>
	</html>