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diff --git a/dom/tests/mochitest/webcomponents/test_shadowroot_style.html b/dom/tests/mochitest/webcomponents/test_shadowroot_style.html
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+++ b/dom/tests/mochitest/webcomponents/test_shadowroot_style.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=806506
+-->
+<head>
+  <title>Test for ShadowRoot styling</title>
+  <script type="text/javascript" src="head.js"></script>
+  <script 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=806506">Bug 806506</a>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+
+var content = '<div class="tall" id="bodydiv"></div>' +
+              '<div id="container"></div>';
+createIframe(content)
+  .then((aDocument) => {
+    var iframeWin = aDocument.defaultView;
+
+    // Create ShadowRoot.
+    var container = aDocument.getElementById("container");
+    var elem = aDocument.createElement("div");
+    container.appendChild(elem); // Put ShadowRoot host in document.
+    var root = elem.attachShadow({mode: "open"});
+
+    // A style element that will be appended into the ShadowRoot.
+    var shadowStyle = aDocument.createElement("style");
+    shadowStyle.innerHTML = ".tall { height: 100px; } .fat { padding-left: inherit; }";
+
+    root.innerHTML = '<div id="divtostyle" class="tall fat"></div>';
+    var divToStyle = root.getElementById("divtostyle");
+
+    // Make sure styleSheet counts are correct after appending a style to the ShadowRoot.
+    is(aDocument.styleSheets.length, 0, "There shouldn't be any style sheet in the test frame document.");
+    is(root.styleSheets.length, 0, "The ShadowRoot should have no style sheets.");
+    root.appendChild(shadowStyle);
+    is(aDocument.styleSheets.length, 0, "Styles in the ShadowRoot element should not be accessible from the document.");
+    is(root.styleSheets.length, 1, "ShadowRoot should have one style sheet from the appened style.");
+    is(root.styleSheets[0].ownerNode, shadowStyle, "First style in ShadowRoot should match the style that was just appended.");
+
+    var dummyStyle = aDocument.createElement("style");
+    root.appendChild(dummyStyle);
+    is(root.styleSheets.length, 2, "ShadowRoot should have an additional style from appending dummyStyle.");
+    is(root.styleSheets[1].ownerNode, dummyStyle, "Second style in ShadowRoot should be the dummyStyle.");
+    root.removeChild(dummyStyle);
+    is(root.styleSheets.length, 1, "Removing dummyStyle should remove it from the ShadowRoot style sheets.");
+    is(root.styleSheets[0].ownerNode, shadowStyle, "The style sheet remaining in the ShadowRoot should be shadowStyle.");
+
+    // Make sure that elements outside of the ShadowRoot are not affected by the ShadowRoot style.
+    isnot(iframeWin.getComputedStyle(aDocument.getElementById("bodydiv")).getPropertyValue("height"), "100px", "Style sheets in ShadowRoot should not apply to elements no in the ShadowRoot.");
+
+    // Make sure that elements in the ShadowRoot are styled according to the ShadowRoot style.
+    is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("height"), "100px", "ShadowRoot style sheets should apply to elements in ShadowRoot.");
+
+    // Tests for author styles not applying in a ShadowRoot.
+    var authorStyle = aDocument.createElement("style");
+    authorStyle.innerHTML = ".fat { padding-right: 20px; padding-left: 30px; }";
+    aDocument.body.appendChild(authorStyle);
+    isnot(iframeWin.getComputedStyle(divToStyle).getPropertyValue("padding-right"), "20px", "Author styles should not apply to ShadowRoot.");
+
+    // Test dynamic changes to style in ShadowRoot.
+    root.innerHTML = '<div id="divtostyle" class="dummy"></div>';
+    divToStyle = root.getElementById("divtostyle");
+    var dummyShadowStyle = aDocument.createElement("style");
+    dummyShadowStyle.innerHTML = ".dummy { height: 300px; }";
+    root.appendChild(dummyShadowStyle);
+    is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("height"), "300px", "Dummy element in ShadowRoot should be styled by style in ShadowRoot.");
+    dummyShadowStyle.innerHTML = ".dummy { height: 200px; }";
+    is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("height"), "200px", "Dynamic changes to styles in ShadowRoot should change style of affected elements.");
+
+    // Test id selector in ShadowRoot style.
+    root.innerHTML = '<style>#divtostyle { padding-top: 10px; }</style><div id="divtostyle"></div>';
+    divToStyle = root.getElementById("divtostyle");
+    is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("padding-top"), "10px", "ID selector in style selector should match element.");
+
+    SimpleTest.finish();
+  });
+</script>
+</body>
+</html>
+