Implement ParentNode IDL interface

LayoutTests/fast/dom/Element/parent-node-interface-expected.txt

Index: LayoutTests/fast/dom/Element/parent-node-interface-expected.txt
diff --git a/LayoutTests/fast/dom/Element/parent-node-interface-expected.txt b/LayoutTests/fast/dom/Element/parent-node-interface-expected.txt
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+++ b/LayoutTests/fast/dom/Element/parent-node-interface-expected.txt
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+This tests that Element implements the ParentNode interface.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS element.children.length is 0
+PASS element.childElementCount is 0
+PASS element.firstElementChild is null
+PASS element.lastElementChild is null
+PASS element.children.length is 0
+PASS element.childElementCount is 0
+PASS element.firstElementChild is null
+PASS element.lastElementChild is null
+PASS element.children.length is 1
+PASS element.childElementCount is 1
+PASS element.children[0] is b
+PASS element.firstElementChild is b
+PASS element.lastElementChild is b
+PASS element.children.length is 1
+PASS element.childElementCount is 1
+PASS element.children[0] is b
+PASS element.firstElementChild is b
+PASS element.lastElementChild is b
+PASS element.children.length is 2
+PASS element.childElementCount is 2
+PASS element.children[0] is b
+PASS element.children[1] is d
+PASS element.firstElementChild is b
+PASS element.lastElementChild is d
+PASS element.children.length is 2
+PASS element.childElementCount is 2
+PASS element.children[0] is b
+PASS element.children[1] is d
+PASS element.firstElementChild is b
+PASS element.lastElementChild is d
+PASS successfullyParsed is true
+
+TEST COMPLETE
+