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<html>
<head>
<meta charset="utf-8">
<script src="../../resources/js-test-pre.js"></script>
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<body>
<script>

description("This test checks the implementation of the element traversal APIs on DocumentFragment as part of the ParentNode interface.");

debug('Test with no children');
var noChildren = document.createDocumentFragment();
shouldBe("noChildren.firstElementChild", "null");
shouldBe("noChildren.lastElementChild", "null");
shouldBe("noChildren.childElementCount", "0");

debug('Test with no element children');
var noElementChildren = document.createDocumentFragment();
noElementChildren.appendChild(document.createComment("comment but not an element"));
noElementChildren.appendChild(document.createTextNode("no elements here"));

shouldBe("noElementChildren.firstElementChild", "null");
shouldBe("noElementChildren.lastElementChild", "null");
shouldBe("noElementChildren.childElementCount", "0");

debug('Test with elements');
var children = document.createDocumentFragment();
children.appendChild(document.createComment("first comment"));
var first = document.createElement('p');
children.appendChild(first);
children.appendChild(document.createComment("a comment"));
var last = document.createElement('p');
children.appendChild(last);
children.appendChild(document.createComment("last comment"));

shouldBe("children.firstElementChild", "first");
shouldBe("children.lastElementChild", "last");
shouldBe("children.childElementCount", "2");

</script>
<script src="../../resources/js-test-post.js"></script>
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</html>
