LayoutTests/accessibility/aria-describedby-on-input.html - WebKit - Git at Google

 <html>
 <script>
     if (window.testRunner)
         testRunner.dumpAsText();
 </script>
 <body>
     <span id="message">This computer will self-destruct in</span>
     <input id="time" type="text" value="10" aria-describedby="description"/>
     <span id="unit"> minutes.</span>
     <div id="description">Allows you to specify the number of minutes after which the computer will self-destruct.</div>
     <div id="result"></div>

     <script>
         if (window.accessibilityController) {
             var labeledItem = document.getElementById("time");
             labeledItem.focus();
             var result = document.getElementById("result");
             result.innerText = "\nThe accessibility description is \"" + accessibilityController.focusedElement.helpText + "\"";
         }
     </script>
 </body>
 </html>
	<html>
	<script>
	if (window.testRunner)
	testRunner.dumpAsText();
	</script>
	<body>
	<span id="message">This computer will self-destruct in</span>
	<input id="time" type="text" value="10" aria-describedby="description"/>
	<span id="unit"> minutes.</span>
	<div id="description">Allows you to specify the number of minutes after which the computer will self-destruct.</div>
	<div id="result"></div>

	<script>
	if (window.accessibilityController) {
	var labeledItem = document.getElementById("time");
	labeledItem.focus();
	var result = document.getElementById("result");
	result.innerText = "\nThe accessibility description is \"" + accessibilityController.focusedElement.helpText + "\"";
	}
	</script>
	</body>
	</html>