third_party/blink/web_tests/paint/invalidation/opacity-from-zero-to-non-zero.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <div id="target" style="width: 100px; height: 100px; background: green; opacity: 0"></div>
 <script src="resources/text-based-repaint.js"></script>
 <script>
 function repaintTest() {
   target.style.opacity = 0.5;
 };
 onload = runRepaintAndPixelTest;
 </script>
	<!DOCTYPE html>
	<div id="target" style="width: 100px; height: 100px; background: green; opacity: 0"></div>
	<script src="resources/text-based-repaint.js"></script>
	<script>
	function repaintTest() {
	target.style.opacity = 0.5;
	};
	onload = runRepaintAndPixelTest;
	</script>