src/third_party/web_platform_tests/dom/nodes/Node-insertBefore.html - cobalt - Git at Google

 <!DOCTYPE html>
 <title>Node.insertBefore</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <div id="log"></div>
 <script>
 function testLeafNode(nodeName, createNodeFunction) {
   test(function() {
     var node = createNodeFunction();
     assert_throws(new TypeError(), function() { node.insertBefore(null, null) })
   }, "Calling insertBefore with a non-Node first argument on a leaf node " + nodeName + " must throw TypeError.")
   test(function() {
     var node = createNodeFunction();
     assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(document.createTextNode("fail"), null) })
     // Would be step 2.
     assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(node, null) })
     // Would be step 3.
     assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(node, document.createTextNode("child")) })
   }, "Calling insertBefore an a leaf node " + nodeName + " must throw HIERARCHY_REQUEST_ERR.")
 }

 test(function() {
   // WebIDL.
   assert_throws(new TypeError(), function() { document.body.insertBefore(null, null) })
   assert_throws(new TypeError(), function() { document.body.insertBefore(null, document.body.firstChild) })
   assert_throws(new TypeError(), function() { document.body.insertBefore({'a':'b'}, document.body.firstChild) })
 }, "Calling insertBefore with a non-Node first argument must throw TypeError.")

 testLeafNode("DocumentType", function () { return document.doctype; } )
 testLeafNode("Text", function () { return document.createTextNode("Foo") })
 testLeafNode("Comment", function () { return document.createComment("Foo") })
 testLeafNode("ProcessingInstruction", function () { return document.createProcessingInstruction("foo", "bar") })

 test(function() {
   // Step 2.
   assert_throws("HIERARCHY_REQUEST_ERR", function() { document.body.insertBefore(document.body, document.getElementById("log")) })
   assert_throws("HIERARCHY_REQUEST_ERR", function() { document.body.insertBefore(document.documentElement, document.getElementById("log")) })
 }, "Calling insertBefore with an inclusive ancestor of the context object must throw HIERARCHY_REQUEST_ERR.")

 // Step 3.
 test(function() {
   var a = document.createElement("div");
   var b = document.createElement("div");
   var c = document.createElement("div");
   assert_throws("NotFoundError", function() {
     a.insertBefore(b, c);
   });
 }, "Calling insertBefore with a reference child whose parent is not the context node must throw a NotFoundError.")

 // Step 4.1.
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   var doc2 = document.implementation.createHTMLDocument("title2");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doc2, doc.documentElement);
   });

   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doc.createTextNode("text"), doc.documentElement);
   });
 }, "If the context node is a document, inserting a document or text node should throw a HierarchyRequestError.")

 // Step 4.2.1.
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   doc.removeChild(doc.documentElement);

   var df = doc.createDocumentFragment();
   df.appendChild(doc.createElement("a"));
   df.appendChild(doc.createElement("b"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, null);
   });

   df = doc.createDocumentFragment();
   df.appendChild(doc.createTextNode("text"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, null);
   });

   df = doc.createDocumentFragment();
   df.appendChild(doc.createComment("comment"));
   df.appendChild(doc.createTextNode("text"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, null);
   });
 }, "If the context node is a document, appending a DocumentFragment that contains a text node or too many elements should throw a HierarchyRequestError.")
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   doc.removeChild(doc.documentElement);

   var df = doc.createDocumentFragment();
   df.appendChild(doc.createElement("a"));
   df.appendChild(doc.createElement("b"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.firstChild);
   });

   df = doc.createDocumentFragment();
   df.appendChild(doc.createTextNode("text"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.firstChild);
   });

   df = doc.createDocumentFragment();
   df.appendChild(doc.createComment("comment"));
   df.appendChild(doc.createTextNode("text"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.firstChild);
   });
 }, "If the context node is a document, inserting a DocumentFragment that contains a text node or too many elements should throw a HierarchyRequestError.")

 // Step 4.2.2.
 test(function() {
   // The context node has an element child.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.appendChild(doc.createComment("foo"));
   assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);

   var df = doc.createDocumentFragment();
   df.appendChild(doc.createElement("a"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.doctype);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.documentElement);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, comment);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, null);
   });
 }, "If the context node is a document, inserting a DocumentFragment with an element if there already is an element child should throw a HierarchyRequestError.")
 test(function() {
   // /child/ is a doctype.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
   doc.removeChild(doc.documentElement);
   assert_array_equals(doc.childNodes, [comment, doc.doctype]);

   var df = doc.createDocumentFragment();
   df.appendChild(doc.createElement("a"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, doc.doctype);
   });
 }, "If the context node is a document and a doctype is following the reference child, inserting a DocumentFragment with an element should throw a HierarchyRequestError.")
 test(function() {
   // /child/ is not null and a doctype is following /child/.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
   doc.removeChild(doc.documentElement);
   assert_array_equals(doc.childNodes, [comment, doc.doctype]);

   var df = doc.createDocumentFragment();
   df.appendChild(doc.createElement("a"));
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(df, comment);
   });
 }, "If the context node is a document, inserting a DocumentFragment with an element before the doctype should throw a HierarchyRequestError.")

 // Step 4.3.
 test(function() {
   // The context node has an element child.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.appendChild(doc.createComment("foo"));
   assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);

   var a = doc.createElement("a");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, doc.doctype);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, doc.documentElement);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, comment);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, null);
   });
 }, "If the context node is a document, inserting an element if there already is an element child should throw a HierarchyRequestError.")
 test(function() {
   // /child/ is a doctype.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
   doc.removeChild(doc.documentElement);
   assert_array_equals(doc.childNodes, [comment, doc.doctype]);

   var a = doc.createElement("a");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, doc.doctype);
   });
 }, "If the context node is a document, inserting an element before the doctype should throw a HierarchyRequestError.")
 test(function() {
   // /child/ is not null and a doctype is following /child/.
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
   doc.removeChild(doc.documentElement);
   assert_array_equals(doc.childNodes, [comment, doc.doctype]);

   var a = doc.createElement("a");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(a, comment);
   });
 }, "If the context node is a document and a doctype is following the reference child, inserting an element should throw a HierarchyRequestError.")

 // Step 4.4.
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
   assert_array_equals(doc.childNodes, [comment, doc.doctype, doc.documentElement]);

   var doctype = document.implementation.createDocumentType("html", "", "");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, comment);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, doc.doctype);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, doc.documentElement);
   });
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, null);
   });
 }, "If the context node is a document, inserting a doctype if there already is a doctype child should throw a HierarchyRequestError.")
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.appendChild(doc.createComment("foo"));
   doc.removeChild(doc.doctype);
   assert_array_equals(doc.childNodes, [doc.documentElement, comment]);

   var doctype = document.implementation.createDocumentType("html", "", "");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, comment);
   });
 }, "If the context node is a document, inserting a doctype after the document element should throw a HierarchyRequestError.")
 test(function() {
   var doc = document.implementation.createHTMLDocument("title");
   var comment = doc.appendChild(doc.createComment("foo"));
   doc.removeChild(doc.doctype);
   assert_array_equals(doc.childNodes, [doc.documentElement, comment]);

   var doctype = document.implementation.createDocumentType("html", "", "");
   assert_throws("HierarchyRequestError", function() {
     doc.insertBefore(doctype, null);
   });
 }, "If the context node is a document with and element child, appending a doctype should throw a HierarchyRequestError.")

 // Step 5.
 test(function() {
   var df = document.createDocumentFragment();
   var a = df.appendChild(document.createElement("a"));

   var doc = document.implementation.createHTMLDocument("title");
   assert_throws("HierarchyRequestError", function() {
     df.insertBefore(doc, a);
   });
   assert_throws("HierarchyRequestError", function() {
     df.insertBefore(doc, null);
   });

   var doctype = document.implementation.createDocumentType("html", "", "");
   assert_throws("HierarchyRequestError", function() {
     df.insertBefore(doctype, a);
   });
   assert_throws("HierarchyRequestError", function() {
     df.insertBefore(doctype, null);
   });
 }, "If the context node is a DocumentFragment, inserting a document or a doctype should throw a HierarchyRequestError.")
 test(function() {
   var el = document.createElement("div");
   var a = el.appendChild(document.createElement("a"));

   var doc = document.implementation.createHTMLDocument("title");
   assert_throws("HierarchyRequestError", function() {
     el.insertBefore(doc, a);
   });
   assert_throws("HierarchyRequestError", function() {
     el.insertBefore(doc, null);
   });

   var doctype = document.implementation.createDocumentType("html", "", "");
   assert_throws("HierarchyRequestError", function() {
     el.insertBefore(doctype, a);
   });
   assert_throws("HierarchyRequestError", function() {
     el.insertBefore(doctype, null);
   });
 }, "If the context node is an element, inserting a document or a doctype should throw a HierarchyRequestError.")

 // Step 7.
 test(function() {
   var a = document.createElement("div");
   var b = document.createElement("div");
   var c = document.createElement("div");
   a.appendChild(b);
   a.appendChild(c);
   assert_array_equals(a.childNodes, [b, c]);
   assert_equals(a.insertBefore(b, b), b);
   assert_array_equals(a.childNodes, [b, c]);
   assert_equals(a.insertBefore(c, c), c);
   assert_array_equals(a.childNodes, [b, c]);
 }, "Inserting a node before itself should not move the node");
 </script>
	<!DOCTYPE html>
	<title>Node.insertBefore</title>
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<div id="log"></div>
	<script>
	function testLeafNode(nodeName, createNodeFunction) {
	test(function() {
	var node = createNodeFunction();
	assert_throws(new TypeError(), function() { node.insertBefore(null, null) })
	}, "Calling insertBefore with a non-Node first argument on a leaf node " + nodeName + " must throw TypeError.")
	test(function() {
	var node = createNodeFunction();
	assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(document.createTextNode("fail"), null) })
	// Would be step 2.
	assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(node, null) })
	// Would be step 3.
	assert_throws("HIERARCHY_REQUEST_ERR", function() { node.insertBefore(node, document.createTextNode("child")) })
	}, "Calling insertBefore an a leaf node " + nodeName + " must throw HIERARCHY_REQUEST_ERR.")
	}

	test(function() {
	// WebIDL.
	assert_throws(new TypeError(), function() { document.body.insertBefore(null, null) })
	assert_throws(new TypeError(), function() { document.body.insertBefore(null, document.body.firstChild) })
	assert_throws(new TypeError(), function() { document.body.insertBefore({'a':'b'}, document.body.firstChild) })
	}, "Calling insertBefore with a non-Node first argument must throw TypeError.")

	testLeafNode("DocumentType", function () { return document.doctype; } )
	testLeafNode("Text", function () { return document.createTextNode("Foo") })
	testLeafNode("Comment", function () { return document.createComment("Foo") })
	testLeafNode("ProcessingInstruction", function () { return document.createProcessingInstruction("foo", "bar") })

	test(function() {
	// Step 2.
	assert_throws("HIERARCHY_REQUEST_ERR", function() { document.body.insertBefore(document.body, document.getElementById("log")) })
	assert_throws("HIERARCHY_REQUEST_ERR", function() { document.body.insertBefore(document.documentElement, document.getElementById("log")) })
	}, "Calling insertBefore with an inclusive ancestor of the context object must throw HIERARCHY_REQUEST_ERR.")

	// Step 3.
	test(function() {
	var a = document.createElement("div");
	var b = document.createElement("div");
	var c = document.createElement("div");
	assert_throws("NotFoundError", function() {
	a.insertBefore(b, c);
	});
	}, "Calling insertBefore with a reference child whose parent is not the context node must throw a NotFoundError.")

	// Step 4.1.
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	var doc2 = document.implementation.createHTMLDocument("title2");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doc2, doc.documentElement);
	});

	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doc.createTextNode("text"), doc.documentElement);
	});
	}, "If the context node is a document, inserting a document or text node should throw a HierarchyRequestError.")

	// Step 4.2.1.
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	doc.removeChild(doc.documentElement);

	var df = doc.createDocumentFragment();
	df.appendChild(doc.createElement("a"));
	df.appendChild(doc.createElement("b"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, null);
	});

	df = doc.createDocumentFragment();
	df.appendChild(doc.createTextNode("text"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, null);
	});

	df = doc.createDocumentFragment();
	df.appendChild(doc.createComment("comment"));
	df.appendChild(doc.createTextNode("text"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, null);
	});
	}, "If the context node is a document, appending a DocumentFragment that contains a text node or too many elements should throw a HierarchyRequestError.")
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	doc.removeChild(doc.documentElement);

	var df = doc.createDocumentFragment();
	df.appendChild(doc.createElement("a"));
	df.appendChild(doc.createElement("b"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.firstChild);
	});

	df = doc.createDocumentFragment();
	df.appendChild(doc.createTextNode("text"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.firstChild);
	});

	df = doc.createDocumentFragment();
	df.appendChild(doc.createComment("comment"));
	df.appendChild(doc.createTextNode("text"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.firstChild);
	});
	}, "If the context node is a document, inserting a DocumentFragment that contains a text node or too many elements should throw a HierarchyRequestError.")

	// Step 4.2.2.
	test(function() {
	// The context node has an element child.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.appendChild(doc.createComment("foo"));
	assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);

	var df = doc.createDocumentFragment();
	df.appendChild(doc.createElement("a"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.doctype);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.documentElement);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, comment);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, null);
	});
	}, "If the context node is a document, inserting a DocumentFragment with an element if there already is an element child should throw a HierarchyRequestError.")
	test(function() {
	// /child/ is a doctype.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
	doc.removeChild(doc.documentElement);
	assert_array_equals(doc.childNodes, [comment, doc.doctype]);

	var df = doc.createDocumentFragment();
	df.appendChild(doc.createElement("a"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, doc.doctype);
	});
	}, "If the context node is a document and a doctype is following the reference child, inserting a DocumentFragment with an element should throw a HierarchyRequestError.")
	test(function() {
	// /child/ is not null and a doctype is following /child/.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
	doc.removeChild(doc.documentElement);
	assert_array_equals(doc.childNodes, [comment, doc.doctype]);

	var df = doc.createDocumentFragment();
	df.appendChild(doc.createElement("a"));
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(df, comment);
	});
	}, "If the context node is a document, inserting a DocumentFragment with an element before the doctype should throw a HierarchyRequestError.")

	// Step 4.3.
	test(function() {
	// The context node has an element child.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.appendChild(doc.createComment("foo"));
	assert_array_equals(doc.childNodes, [doc.doctype, doc.documentElement, comment]);

	var a = doc.createElement("a");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, doc.doctype);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, doc.documentElement);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, comment);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, null);
	});
	}, "If the context node is a document, inserting an element if there already is an element child should throw a HierarchyRequestError.")
	test(function() {
	// /child/ is a doctype.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
	doc.removeChild(doc.documentElement);
	assert_array_equals(doc.childNodes, [comment, doc.doctype]);

	var a = doc.createElement("a");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, doc.doctype);
	});
	}, "If the context node is a document, inserting an element before the doctype should throw a HierarchyRequestError.")
	test(function() {
	// /child/ is not null and a doctype is following /child/.
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
	doc.removeChild(doc.documentElement);
	assert_array_equals(doc.childNodes, [comment, doc.doctype]);

	var a = doc.createElement("a");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(a, comment);
	});
	}, "If the context node is a document and a doctype is following the reference child, inserting an element should throw a HierarchyRequestError.")

	// Step 4.4.
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.insertBefore(doc.createComment("foo"), doc.firstChild);
	assert_array_equals(doc.childNodes, [comment, doc.doctype, doc.documentElement]);

	var doctype = document.implementation.createDocumentType("html", "", "");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, comment);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, doc.doctype);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, doc.documentElement);
	});
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, null);
	});
	}, "If the context node is a document, inserting a doctype if there already is a doctype child should throw a HierarchyRequestError.")
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.appendChild(doc.createComment("foo"));
	doc.removeChild(doc.doctype);
	assert_array_equals(doc.childNodes, [doc.documentElement, comment]);

	var doctype = document.implementation.createDocumentType("html", "", "");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, comment);
	});
	}, "If the context node is a document, inserting a doctype after the document element should throw a HierarchyRequestError.")
	test(function() {
	var doc = document.implementation.createHTMLDocument("title");
	var comment = doc.appendChild(doc.createComment("foo"));
	doc.removeChild(doc.doctype);
	assert_array_equals(doc.childNodes, [doc.documentElement, comment]);

	var doctype = document.implementation.createDocumentType("html", "", "");
	assert_throws("HierarchyRequestError", function() {
	doc.insertBefore(doctype, null);
	});
	}, "If the context node is a document with and element child, appending a doctype should throw a HierarchyRequestError.")

	// Step 5.
	test(function() {
	var df = document.createDocumentFragment();
	var a = df.appendChild(document.createElement("a"));

	var doc = document.implementation.createHTMLDocument("title");
	assert_throws("HierarchyRequestError", function() {
	df.insertBefore(doc, a);
	});
	assert_throws("HierarchyRequestError", function() {
	df.insertBefore(doc, null);
	});

	var doctype = document.implementation.createDocumentType("html", "", "");
	assert_throws("HierarchyRequestError", function() {
	df.insertBefore(doctype, a);
	});
	assert_throws("HierarchyRequestError", function() {
	df.insertBefore(doctype, null);
	});
	}, "If the context node is a DocumentFragment, inserting a document or a doctype should throw a HierarchyRequestError.")
	test(function() {
	var el = document.createElement("div");
	var a = el.appendChild(document.createElement("a"));

	var doc = document.implementation.createHTMLDocument("title");
	assert_throws("HierarchyRequestError", function() {
	el.insertBefore(doc, a);
	});
	assert_throws("HierarchyRequestError", function() {
	el.insertBefore(doc, null);
	});

	var doctype = document.implementation.createDocumentType("html", "", "");
	assert_throws("HierarchyRequestError", function() {
	el.insertBefore(doctype, a);
	});
	assert_throws("HierarchyRequestError", function() {
	el.insertBefore(doctype, null);
	});
	}, "If the context node is an element, inserting a document or a doctype should throw a HierarchyRequestError.")

	// Step 7.
	test(function() {
	var a = document.createElement("div");
	var b = document.createElement("div");
	var c = document.createElement("div");
	a.appendChild(b);
	a.appendChild(c);
	assert_array_equals(a.childNodes, [b, c]);
	assert_equals(a.insertBefore(b, b), b);
	assert_array_equals(a.childNodes, [b, c]);
	assert_equals(a.insertBefore(c, c), c);
	assert_array_equals(a.childNodes, [b, c]);
	}, "Inserting a node before itself should not move the node");
	</script>