LayoutTests/fast/text/document-fonts-while-loading-crash.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <script>
 if (window.internals) {
     internals.invalidateFontCache();
     internals.clearMemoryCache();
 }
 if (window.testRunner) {
     testRunner.waitUntilDone();
     testRunner.dumpAsText();
 }
 </script>
 <style>
 @font-face {
     font-family: "WebFont";
     src: url("../../resources/Ahem.otf") format("opentype");
 }
 </style>
 </head>
 <body>
 This test passes if there is no ASSERT in debug mode. This happens when:
 <ol>
 <li>No one uses the CSS Font Loading API</li>
 <li>A font starts loading</li>
 <li>Someone uses the CSS Font Loading API, causing us to create Javascript wrappers for our internal objects</li>
 <li>The font finishes loading</li>
 </ol>
 The bug occurs when the wrappers do not correctly understand that there are in-flight loads already happening.
 <div style="font-family: 'WebFont';">Hello</div>
 <script>
 document.body.offsetTop; // Force layout, which starts fonts loading
 document.fonts.ready.then(function() {
     if (window.testRunner)
         testRunner.notifyDone();
 });
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<script>
	if (window.internals) {
	internals.invalidateFontCache();
	internals.clearMemoryCache();
	}
	if (window.testRunner) {
	testRunner.waitUntilDone();
	testRunner.dumpAsText();
	}
	</script>
	<style>
	@font-face {
	font-family: "WebFont";
	src: url("../../resources/Ahem.otf") format("opentype");
	}
	</style>
	</head>
	<body>
	This test passes if there is no ASSERT in debug mode. This happens when:
	<ol>
	<li>No one uses the CSS Font Loading API</li>
	<li>A font starts loading</li>
	<li>Someone uses the CSS Font Loading API, causing us to create Javascript wrappers for our internal objects</li>
	<li>The font finishes loading</li>
	</ol>
	The bug occurs when the wrappers do not correctly understand that there are in-flight loads already happening.
	<div style="font-family: 'WebFont';">Hello</div>
	<script>
	document.body.offsetTop; // Force layout, which starts fonts loading
	document.fonts.ready.then(function() {
	if (window.testRunner)
	testRunner.notifyDone();
	});
	</script>
	</body>
	</html>