third_party/blink/web_tests/images/update-alt-text.html - chromium/src - Git at Google

 <!doctype HTML>
 Ensure we can update the alt text on an image that has failed to load.
 <img id="img" src="none" alt="FAIL">
 <script>
     document.body.offsetTop;
     var img = document.getElementById('img');
     img.onerror = function() { img.alt = "PASS"; }
 </script>
	<!doctype HTML>
	Ensure we can update the alt text on an image that has failed to load.
	<img id="img" src="none" alt="FAIL">
	<script>
	document.body.offsetTop;
	var img = document.getElementById('img');
	img.onerror = function() { img.alt = "PASS"; }
	</script>