LayoutTests/fast/frames/resources/sandboxed-iframe-form-allowed.html - WebKit - Git at Google

 <body onload="document.getElementById('form').submit();">
 <form id="form" action="javascript:window.top.allowedFormSubmitted();">
     <input name=x value=y type="checkbox" checked="yes"/>
 </form>
 </body>
	<body onload="document.getElementById('form').submit();">
	<form id="form" action="javascript:window.top.allowedFormSubmitted();">
	<input name=x value=y type="checkbox" checked="yes"/>
	</form>
	</body>