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+<!DOCTYPE html>
+<html>
+<head>
+<title>Shadow DOM: Slottable mixin</title>
+<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
+<meta name="assert" content="Element and Text interfaces must implement Slottable mixin">
+<link rel="help" href="https://dom.spec.whatwg.org/#slotable">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+
+test(function () {
+    assert_true('assignedSlot' in Element.prototype, 'assignedSlot must be defined on Element.prototype');
+    assert_true('assignedSlot' in document.createElement('div'), 'assignedSlot must be defined on a div element');
+
+    assert_true('assignedSlot' in Text.prototype, 'assignedSlot must be defined on Text.prototype');
+    assert_true('assignedSlot' in document.createTextNode(''), 'assignedSlot must be defined on a text node');
+    assert_false('assignedSlot' in document.createComment(''), 'assignedSlot must not be defined on a comment node');
+    assert_false('assignedSlot' in document.createProcessingInstruction('target', 'data'), 'assignedSlot must not be defined on a processing instruction node');
+
+}, 'assignedSlot attribute must be defined on Element and Text interfaces');
+
+test(function () {
+    assert_equals(document.createElement('div').assignedSlot, null, 'assignedSlot must be null when the element is not in any tree');
+
+    var shadowHost = document.createElement('div');
+    var shadowRoot = shadowHost.attachShadow({mode: 'open'});
+
+    var childElement = document.createElement('b');
+    shadowHost.appendChild(childElement);
+    assert_equals(childElement.assignedSlot, null, 'assignedSlot on an element must be null when a node is not assigned of any slot');
+
+    var childTextNode = document.createTextNode('');
+    shadowHost.appendChild(childTextNode);
+    assert_equals(childTextNode.assignedSlot, null, 'assignedSlot on a text node must be null when a node is not assigned of any slot');
+
+    var slot = document.createElement('slot');
+    slot.name = 'foo';
+    shadowRoot.appendChild(slot);
+    assert_equals(childElement.assignedSlot, null, 'assignedSlot on an element must be null when a node does not match any slot');
+    assert_equals(childTextNode.assignedSlot, null, 'assignedSlot on a text node must be null when a node does not match any slot');
+
+}, 'assignedSlot must return null when the node does not have an assigned node');
+
+test(function () {
+    var shadowHost = document.createElement('div');
+    var childElement = document.createElement('b');
+    shadowHost.appendChild(childElement);
+
+    var childTextNode = document.createTextNode('');
+    shadowHost.appendChild(childTextNode);
+
+    var shadowRoot = shadowHost.attachShadow({mode: 'open'});
+    var slot = document.createElement('slot');
+    shadowRoot.appendChild(slot);
+
+    assert_equals(childElement.assignedSlot, slot, 'assignedSlot on an element must return the assigned default slot element');
+    assert_equals(childTextNode.assignedSlot, slot, 'assignedSlot on a text node must return the assigned default slot element');
+
+    slot.name = 'foo';
+    assert_equals(childElement.assignedSlot, null, 'assignedSlot on an element must null when the element is unassigned from a slot element');
+    assert_equals(childTextNode.assignedSlot, null, 'assignedSlot on a text node must null when the node is unassigned from a slot element');
+
+    childElement.slot = 'foo';
+    assert_equals(childElement.assignedSlot, slot, 'assignedSlot on an element must return the re-assigned slot element');
+
+    slot.removeAttribute('name');
+    assert_equals(childTextNode.assignedSlot, slot, 'assignedSlot on a text node must return the re-assigned slot element');
+
+}, 'assignedSlot must return the assigned slot');
+
+test(function () {
+    var shadowHost = document.createElement('div');
+    var childElement = document.createElement('b');
+    shadowHost.appendChild(childElement);
+
+    var childTextNode = document.createTextNode('');
+    shadowHost.appendChild(childTextNode);
+
+    var shadowRoot = shadowHost.attachShadow({mode: 'closed'});
+    var slot = document.createElement('slot');
+    shadowRoot.appendChild(slot);
+
+    assert_equals(childElement.assignedSlot, null, 'assignedSlot on an element must return null if the slot is inside a closed shadow tree.');
+    assert_equals(childTextNode.assignedSlot, null, 'assignedSlot on a text node must return null if the slot is inside a closed shadow tree.');
+
+}, 'assignedSlot must return null when the assigned slot element is inside a closed shadow tree');
+
+</script>
+</body>
+</html>