ManualTests/button-that-focuses-itself-on-click.html - WebKit - Git at Google

 <head>
     <meta name="viewport" content="width=device-width">
     <script>
         var haveClicked = false;
         function runTest(e) {
             if (haveClicked) {
                 e.value = "Test passed";
                 e.disabled = true;
                 return;
             }
             e.value = "Click me again";
             e.focus();
             haveClicked = true;
         }
     </script>
 </head>

 <body>
     <center>
         <input type=submit onclick="runTest(this); return false;" value="Click me" style="font-size: 36px">
     </center>
     <br><br>
     <div style="font-size: 20px; font-family: helvetica;">
         Test for WebKit bug #<a href="https://bugs.webkit.org/show_bug.cgi?id=143624">143624</a>
         <br><br>
         Tap button above twice to run test. &ldquo;Test passed&rdquo; will
         appear above if the test passes. If you cannot click the button a
         second time, the test failed.
         <br><br>
         To rerun this test, open it in a new tab. Do not reload.
     </div>
 </body>
	<head>
	<meta name="viewport" content="width=device-width">
	<script>
	var haveClicked = false;
	function runTest(e) {
	if (haveClicked) {
	e.value = "Test passed";
	e.disabled = true;
	return;
	}
	e.value = "Click me again";
	e.focus();
	haveClicked = true;
	}
	</script>
	</head>

	<body>
	<center>
	<input type=submit onclick="runTest(this); return false;" value="Click me" style="font-size: 36px">
	</center>
	<br><br>
	<div style="font-size: 20px; font-family: helvetica;">
	Test for WebKit bug #<a href="https://bugs.webkit.org/show_bug.cgi?id=143624">143624</a>
	<br><br>
	Tap button above twice to run test. “Test passed” will
	appear above if the test passes. If you cannot click the button a
	second time, the test failed.
	<br><br>
	To rerun this test, open it in a new tab. Do not reload.
	</div>
	</body>