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diff --git a/testing/web-platform/tests/custom-elements/CustomElementRegistry-getName.tentative.html b/testing/web-platform/tests/custom-elements/CustomElementRegistry-getName.tentative.html
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+++ b/testing/web-platform/tests/custom-elements/CustomElementRegistry-getName.tentative.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>Custom Elements: CustomElementRegistry.getName function</title>
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com">
+<meta name="assert" content="CustomElementRegistry.getName function exists">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function () {
+  assert_equals(customElements.getName(class extends HTMLElement {}), null);
+}, 'customElements.getName must return null when the registry does not contain an entry with the given constructor');
+
+test(function () {
+  assert_throws_js(TypeError, function () { customElements.getName(undefined); },
+        'customElements.getName must throw a TypeError when the element interface is undefined');
+  assert_throws_js(TypeError, function () { customElements.getName(null); },
+        'customElements.getName must throw a TypeError when the element interface is null');
+  assert_throws_js(TypeError, function () { customElements.getName('foo-bar'); },
+        'customElements.getName must throw a TypeError when the element interface is a string');
+  assert_throws_js(TypeError, function () { customElements.getName(1); },
+        'customElements.getName must throw a TypeError when the element interface is a number');
+  assert_throws_js(TypeError, function () { customElements.getName({}); },
+        'customElements.getName must throw a TypeError when the element interface is an object');
+  assert_throws_js(TypeError, function () { customElements.getName([]) },
+        'customElements.getName must throw a TypeError when the element interface is an array');
+}, 'customElements.getName must throw when the element interface is not a constructor');
+
+test(function () {
+    class OtherExistingCustomElement extends HTMLElement {};
+    class SecondExistingCustomElement extends HTMLElement {};
+    assert_throws_js(TypeError, function () { customElements.getName(customElements.getName(OtherExistingCustomElement)); },
+        'customElements.getName must throw a TypeError when the element interface is undefined');
+    customElements.define('other-existing-custom-element', OtherExistingCustomElement);
+    customElements.define('second-existing-custom-element', SecondExistingCustomElement);
+    assert_equals(customElements.getName(OtherExistingCustomElement), 'other-existing-custom-element');
+    assert_equals(customElements.getName(SecondExistingCustomElement), 'second-existing-custom-element');
+}, 'customElements.getName returns the name of the entry with the given constructor when there is a matching entry.');
+
+test(function () {
+    class ButtonCustomBuiltInElement extends HTMLButtonElement {};
+    class InputCustomBuiltInElement extends HTMLInputElement {};
+    customElements.define('button-custom-built-in-element', ButtonCustomBuiltInElement, { extends: 'button' });
+    customElements.define('input-custom-built-in-element', InputCustomBuiltInElement, { extends: 'input' });
+    assert_equals(customElements.getName(ButtonCustomBuiltInElement), 'button-custom-built-in-element');
+    assert_equals(customElements.getName(InputCustomBuiltInElement), 'input-custom-built-in-element');
+}, 'customElements.getName returns the name of the entry with the given customized built in constructor when there is a matching entry.');
+</script>