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@@ -0,0 +1,127 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=806506
+-->
+<head>
+  <title>Test for HTMLContent element</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>
+
+/**
+ * Constructs a node with a nested ShadowRoot with the following structure:
+ * <span> - - - - - - - - - - <ShadowRoot>
+ *   <span>                     <span> - - - - - - - - - - <ShadowRoot>
+ *    id=one                      id=four                    <span>
+ *    data-color=red              data-color=orange            id=eleven
+ *   <span>                       <span>                     <content>
+ *    id=two                        id=five                    id=twelve
+ *    data-color=blue               data-color=purple          select=secondSelect
+ *   <span>                       <content>                  <span>
+ *    id=three                      id=six                     id=thirteen
+ *    data-color=green              select=firstSelect
+ *                                  <span>
+ *                                    id=seven
+ *                                  <content>
+ *                                    id=eight
+ *                                  <span>
+ *                                    id=nine
+ *                                <span>
+ *                                  id=ten
+ *                                  data-color=grey
+ */
+function constructTree(firstSelect, secondSelect) {
+  var rootSpan = document.createElement("span");
+  rootSpan.innerHTML = '<span id="one" data-color="red"></span><span id="two" data-color="blue"></span><span id="three" data-color="green"></span>';
+  var firstShadow = rootSpan.createShadowRoot();
+  firstShadow.innerHTML = '<span id="four" data-color="orange"><span id="five" data-color="purple"></span><content id="six" select="' + firstSelect + '"><span id="seven"></span><content id="eight"></content><span id="nine"></span></content><span id="ten"></span></span>';
+  var secondShadow = firstShadow.firstChild.createShadowRoot();
+  secondShadow.innerHTML = '<span id="eleven"></span><content id="twelve" select="' + secondSelect + '"></content><span id="thirteen"></span>';
+  return rootSpan;
+}
+
+// Create a tree with content that matches on everything and check node distribution.
+var allSpan = constructTree("*", "*");
+var firstContent = allSpan.shadowRoot.getElementById("six");
+var firstDistNodes = firstContent.getDistributedNodes();
+is(firstDistNodes.length, 3, "Universal selector should match all nodes.");
+// Check the order of the distributed nodes.
+is(firstDistNodes.item(0).id, "one", "First distributed node should have id of 'one'");
+is(firstDistNodes.item(1).id, "two", "Second distributed node should have id of 'two'");
+is(firstDistNodes.item(2).id, "three", "Third distributed node should have id of 'three'");
+var secondContent = allSpan.shadowRoot.firstChild.shadowRoot.getElementById("twelve");
+var secondDistNodes = secondContent.getDistributedNodes();
+is(secondDistNodes.length, 5, "Universial selector should match all nodes including those distributed into content.");
+// Check the order of the distribute nodes.
+is(secondDistNodes.item(0).id, "five", "First distributed node should have id of 'five'");
+is(secondDistNodes.item(1).id, "one", "Second distributed (reprojected) node should have id of 'one'");
+is(secondDistNodes.item(2).id, "two", "Third distributed (reprojected) node should have id of 'two'");
+is(secondDistNodes.item(3).id, "three", "Fourth distributed (reprojected) node should have id of 'three'");
+is(secondDistNodes.item(4).id, "ten", "Fifth distributed node should have id of 'ten'");
+
+// Append an element after id=two and make sure that it is inserted into the corrent
+// position in the insertion points.
+var additionalSpan = document.createElement("span");
+additionalSpan.id = "additional";
+
+// Insert the additional span in the third position, before the span with id=three.
+allSpan.insertBefore(additionalSpan, allSpan.childNodes.item(2));
+firstDistNodes = firstContent.getDistributedNodes();
+secondDistNodes = secondContent.getDistributedNodes();
+is(firstDistNodes.length, 4, "First insertion point should match one more node.");
+is(firstDistNodes.item(2).id, "additional", "Additional span should have been inserted into the third position of the first insertion point.");
+
+is(secondDistNodes.length, 6, "Second insertion point should match one more node.");
+is(secondDistNodes.item(3).id, "additional", "Additional span should have been inserted into the fourth position of the second insertion point.");
+
+function nodeListDoesNotContain(nodeList, element) {
+  for (var i = 0; i < nodeList.length; i++) {
+    if (nodeList[i] == element) {
+      return false;
+    }
+  }
+  return true;
+}
+
+// Remove the span with id=one and check that it is removed from all insertion points.
+allSpan = constructTree("*", "*");
+var spanOne = allSpan.firstChild;
+allSpan.removeChild(spanOne);
+firstContent = allSpan.shadowRoot.getElementById("six");
+ok(nodeListDoesNotContain(firstContent.getDistributedNodes(), spanOne), "Child removed from host should not appear in insertion point node list.");
+secondContent = allSpan.shadowRoot.firstChild.shadowRoot.getElementById("twelve");
+ok(nodeListDoesNotContain(secondContent.getDistributedNodes(), spanOne), "Child removed from host should not appear in nested insertion point node list.");
+
+// Make sure <content> in fallback content is inactive.
+// First insertion point will not match anything and will use fallback content.
+allSpan = constructTree("#nomatch", "*");
+var fallbackInsertionPoint = allSpan.shadowRoot.getElementById("eight");
+is(fallbackInsertionPoint.getDistributedNodes().length, 0, "Insertion points in default content should be inactive.");
+
+// Insertion points with non-universal selectors.
+allSpan = constructTree("span[data-color=blue]", "*");
+firstContent = allSpan.shadowRoot.getElementById("six");
+is(firstContent.getDistributedNodes().length, 1, "Insertion point selector should only match one node.");
+is(firstContent.getDistributedNodes()[0].dataset.color, "blue", "Projected node should match selector.");
+secondContent = allSpan.shadowRoot.firstChild.shadowRoot.getElementById("twelve");
+is(secondContent.getDistributedNodes().length, 3, "Second insertion point should match two children and one reprojected node.");
+is(secondContent.getDistributedNodes()[1].dataset.color, "blue", "Projected node should match selector.");
+
+allSpan = constructTree("span[data-color=blue]", "span[data-color=blue]");
+firstContent = allSpan.shadowRoot.getElementById("six");
+is(firstContent.getDistributedNodes().length, 1, "Insertion point selector should only match one node.");
+is(firstContent.getDistributedNodes()[0].dataset.color, "blue", "Projected node should match selector.");
+secondContent = allSpan.shadowRoot.firstChild.shadowRoot.getElementById("twelve");
+is(secondContent.getDistributedNodes().length, 1, "Insertion point should only match reprojected node.");
+is(secondContent.getDistributedNodes()[0].dataset.color, "blue", "Projected node should match selector.");
+
+// Make sure that dynamically appended default content will get distributed.
+</script>
+</body>
+</html>
+