<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=509244 --> <head> <title>Test for Bug 509244</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=509244">Mozilla Bug 509244</a> <p id="display">A</p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 509244 **/ function flush() { document.documentElement.offsetHeight; } var text = document.getElementById("display"); // layout text, caching monospace font text.style.fontFamily = "monospace"; flush(); // relayout text so that monospace font is no longer used (but cached) text.style.fontFamily = "sans-serif"; flush(); // flush cache var os = SpecialPowers.Cc["@mozilla.org/observer-service;1"] .getService(SpecialPowers.Ci.nsIObserverService); os.notifyObservers(null, "memory-pressure", "heap-minimize"); // reuse font that was flushed from cache text.style.fontFamily = "monospace"; flush(); ok(true, "not crashed"); </script> </pre> </body> </html>