<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=806506 --> <head> <title>Test for styling fallback content</title> <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> </head> <body> <div id="grabme"></div> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=806506">Bug 806506</a> <script> var host = document.getElementById("grabme"); var shadow = host.createShadowRoot(); shadow.innerHTML = '<style id="innerstyle"></style><span id="container"><content><span id="innerspan">Hello</span></content></span>'; var innerStyle = shadow.getElementById("innerstyle"); innerStyle.innerHTML = '#innerspan { margin-top: 10px; }'; var innerSpan = shadow.getElementById("innerspan"); is(getComputedStyle(innerSpan, null).getPropertyValue("margin-top"), "10px", "Default content should be style by id selector."); innerStyle.innerHTML = '#container > content > #innerspan { margin-top: 30px; }'; is(getComputedStyle(innerSpan, null).getPropertyValue("margin-top"), "30px", "Default content should be style by child combinators."); </script> </body> </html>