<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=771043 --> <head> <meta charset="utf-8"> <title>Test for Bug 771043</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 771043 **/ var expectedValue; var callCount = 0; var storedHeight; function callback(arg) { ++callCount; is(arg.matches, expectedValue, "Should have the right value on call #" + callCount + " to the callback"); SimpleTest.executeSoon(tests.shift()); } function flushLayout() { storedHeight = document.querySelector("iframe").offsetHeight; } function setHeight(height) { var ifr = document.querySelector("iframe"); ifr.style.height = height + "px"; flushLayout(); } SimpleTest.waitForExplicitFinish(); var tests = [ () => { expectedValue = true; setHeight(50); }, () => { expectedValue = false; setHeight(200); }, () => { var ifr = document.querySelector("iframe"); ifr.style.display = "none"; flushLayout(); ifr.style.display = ""; expectedValue = true; setHeight(50); }, () => { expectedValue = false; setHeight(200); }, SimpleTest.finish.bind(SimpleTest) ]; addLoadEvent(function() { var mql = frames[0].matchMedia("(orientation: landscape)"); mql.addListener(callback); tests.shift()(); }); </script> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=771043">Mozilla Bug 771043</a> <!-- Important: the iframe needs to be displayed --> <p id="display"><iframe style="width: 100px; height: 200px"</p> <div id="content" style="display: none"> </div> <pre id="test"> </pre> </body> </html>