1 files changed, 86 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/nodes/pre-insertion-validation-hierarchy.js b/testing/web-platform/tests/dom/nodes/pre-insertion-validation-hierarchy.js
new file mode 100644
index 0000000000..6ef2576df2
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/pre-insertion-validation-hierarchy.js
@@ -0,0 +1,86 @@
+/**
+ * Validations where `child` argument is irrelevant.
+ * @param {Function} methodName
+ */
+function preInsertionValidateHierarchy(methodName) {
+  function insert(parent, node) {
+    if (parent[methodName].length > 1) {
+      // This is for insertBefore(). We can't blindly pass `null` for all methods
+      // as doing so will move nodes before validation.
+      parent[methodName](node, null);
+    } else {
+      parent[methodName](node);
+    }
+  }
+
+  // Step 2
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    assert_throws_dom("HierarchyRequestError", () => insert(doc.body, doc.body));
+    assert_throws_dom("HierarchyRequestError", () => insert(doc.body, doc.documentElement));
+  }, "If node is a host-including inclusive ancestor of parent, then throw a HierarchyRequestError DOMException.");
+
+  // Step 4
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    const doc2 = document.implementation.createHTMLDocument("title2");
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, doc2));
+  }, "If node is not a DocumentFragment, DocumentType, Element, Text, ProcessingInstruction, or Comment node, then throw a HierarchyRequestError DOMException.");
+
+  // Step 5, in case of inserting a text node into a document
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, doc.createTextNode("text")));
+  }, "If node is a Text node and parent is a document, then throw a HierarchyRequestError DOMException.");
+
+  // Step 5, in case of inserting a doctype into a non-document
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    const doctype = doc.childNodes[0];
+    assert_throws_dom("HierarchyRequestError", () => insert(doc.createElement("a"), doctype));
+  }, "If node is a doctype and parent is not a document, then throw a HierarchyRequestError DOMException.")
+
+  // Step 6, in case of DocumentFragment including multiple elements
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    doc.documentElement.remove();
+    const df = doc.createDocumentFragment();
+    df.appendChild(doc.createElement("a"));
+    df.appendChild(doc.createElement("b"));
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, df));
+  }, "If node is a DocumentFragment with multiple elements and parent is a document, then throw a HierarchyRequestError DOMException.");
+
+  // Step 6, in case of DocumentFragment has multiple elements when document already has an element
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    const df = doc.createDocumentFragment();
+    df.appendChild(doc.createElement("a"));
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, df));
+  }, "If node is a DocumentFragment with an element and parent is a document with another element, then throw a HierarchyRequestError DOMException.");
+
+  // Step 6, in case of an element
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    const el = doc.createElement("a");
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, el));
+  }, "If node is an Element and parent is a document with another element, then throw a HierarchyRequestError DOMException.");
+
+  // Step 6, in case of a doctype when document already has another doctype
+  test(() => {
+    const doc = document.implementation.createHTMLDocument("title");
+    const doctype = doc.childNodes[0].cloneNode();
+    doc.documentElement.remove();
+    assert_throws_dom("HierarchyRequestError", () => insert(doc, doctype));
+  }, "If node is a doctype and parent is a document with another doctype, then throw a HierarchyRequestError DOMException.");
+
+  // Step 6, in case of a doctype when document has an element
+  if (methodName !== "prepend") {
+    // Skip `.prepend` as this doesn't throw if `child` is an element
+    test(() => {
+      const doc = document.implementation.createHTMLDocument("title");
+      const doctype = doc.childNodes[0].cloneNode();
+      doc.childNodes[0].remove();
+      assert_throws_dom("HierarchyRequestError", () => insert(doc, doctype));
+    }, "If node is a doctype and parent is a document with an element, then throw a HierarchyRequestError DOMException.");
+  }
+}