<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=536379 --> <head> <title>Test for Bug 536379</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <link rel="stylesheet" type="text/css" href="data:text/css,@import 'data:text/css,p { color: green }'"> <link rel="stylesheet" type="text/css" href="data:text/css,@import "data:text/css,@import 'data:text/css,p { color: green }'""> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=536379">Mozilla Bug 536379</a> <p id="display"></p> <pre id="test"> <script type="application/javascript"> /** Test for Bug 536379 **/ const CI = SpecialPowers.Ci; const CC = SpecialPowers.Cc; var domUtils = CC["@mozilla.org/inspector/dom-utils;1"].getService(CI.inIDOMUtils); var rules = domUtils.getCSSStyleRules(document.getElementById("display")); var firstPRule = rules.GetElementAt(rules.Count() - 2).QueryInterface(CI.nsIDOMCSSStyleRule); firstPRule.style.removeProperty("color"); ok(true, "should not crash"); </script> </pre> </body> </html>