<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=990340 --> <head> <meta charset="utf-8"> <title>Test for Bug 990340</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script type="application/javascript"> /** Test for Bug 990340 **/ function testbug990340() { ok(document.querySelector('#bug990340 span').clientHeight < 100, "'height' is in transition") SimpleTest.finish(); } SimpleTest.waitForExplicitFinish(); </script> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=990340">Mozilla Bug 990340</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <style type="text/css"> #bug990340::before { content: ":before"; } #bug990340 span { display: inline-block; border:1px solid blue; height: 20px; transition: height 30s; } #bug990340.s span { height: 100px; } </style> <div id="bug990340" style="overflow:scroll"> <span>Transition height</span> </div> </pre> <script> document.body.offsetHeight; document.querySelector('#bug990340').className='s'; testbug990340() </script> </body> </html>