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diff --git a/testing/web-platform/tests/dom/nodes/Element-matches-init.js b/testing/web-platform/tests/dom/nodes/Element-matches-init.js
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+++ b/testing/web-platform/tests/dom/nodes/Element-matches-init.js
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+function init(e, method) {
+  /*
+   * This test suite tests Selectors API methods in 4 different contexts:
+   * 1. Document node
+   * 2. In-document Element node
+   * 3. Detached Element node (an element with no parent, not in the document)
+   * 4. Document Fragment node
+   *
+   * For each context, the following tests are run:
+   *
+   * The interface check tests ensure that each type of node exposes the Selectors API methods.
+   *
+   * The matches() tests are run
+   * All the selectors tested for both the valid and invalid selector tests are found in selectors.js.
+   * See comments in that file for documentation of the format used.
+   *
+   * The level2-lib.js file contains all the common test functions for running each of the aforementioned tests
+   */
+
+  var docType  = "html"; // Only run tests suitable for HTML
+
+  // Prepare the nodes for testing
+  var doc = e.target.contentDocument;                 // Document Node tests
+
+  var element = doc.getElementById("root");   // In-document Element Node tests
+
+  //Setup the namespace tests
+  setupSpecialElements(doc, element);
+
+  var outOfScope = element.cloneNode(true);   // Append this to the body before running the in-document
+                                               // Element tests, but after running the Document tests. This
+                                               // tests that no elements that are not descendants of element
+                                               // are selected.
+
+  traverse(outOfScope, function(elem) {        // Annotate each element as being a clone; used for verifying
+    elem.setAttribute("data-clone", "");     // that none of these elements ever match.
+  });
+
+
+  var detached = element.cloneNode(true);     // Detached Element Node tests
+
+  var fragment = doc.createDocumentFragment(); // Fragment Node tests
+  fragment.appendChild(element.cloneNode(true));
+
+  // Setup Tests
+  interfaceCheckMatches(method, "Document", doc);
+  interfaceCheckMatches(method, "Detached Element", detached);
+  interfaceCheckMatches(method, "Fragment", fragment);
+  interfaceCheckMatches(method, "In-document Element", element);
+
+  runSpecialMatchesTests(method, "DIV Element", element);
+  runSpecialMatchesTests(method, "NULL Element", document.createElement("null"));
+  runSpecialMatchesTests(method, "UNDEFINED Element", document.createElement("undefined"));
+
+  runInvalidSelectorTestMatches(method, "Document", doc, invalidSelectors);
+  runInvalidSelectorTestMatches(method, "Detached Element", detached, invalidSelectors);
+  runInvalidSelectorTestMatches(method, "Fragment", fragment, invalidSelectors);
+  runInvalidSelectorTestMatches(method, "In-document Element", element, invalidSelectors);
+
+  runMatchesTest(method, "In-document", doc, validSelectors, "html");
+  runMatchesTest(method, "Detached", detached, validSelectors, "html");
+  runMatchesTest(method, "Fragment", fragment, validSelectors, "html");
+
+  runMatchesTest(method, "In-document", doc, scopedSelectors, "html");
+}