diff --git a/html/semantics/popups/popup-hoverpopup-attribute.tentative.html b/html/semantics/popups/popup-hoverpopup-attribute.tentative.html
deleted file mode 100644
index 5c8caa4bff0ea1..00000000000000
--- a/html/semantics/popups/popup-hoverpopup-attribute.tentative.html
+++ /dev/null
@@ -1,92 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8" />
-<title>The hoverpopup attribute</title>
-<link rel="author" href="mailto:masonf@chromium.org">
-<link rel=help href="https://open-ui.org/components/popup.research.explainer">
-<meta name="timeout" content="long">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-actions.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
-<script src="resources/popup-utils.js"></script>
-
-<body>
-<style>
-  div {top:100px;}
-  [popup] {top:200px;}
-</style>
-<script>
-let nextId = 0;
-async function makePopUpAndInvoker(test, popUpType) {
-  const popUp = Object.assign(document.createElement('div'),{popUp: popUpType, id: `pop-up-${nextId++}`});
-  document.body.appendChild(popUp);
-  popUp.textContent = 'Pop-up';
-  const invoker = document.createElement('div');
-  document.body.appendChild(invoker);
-  invoker.textContent = 'Invoker';
-  invoker.setAttribute('hoverpopup',popUp.id);
-  test.add_cleanup(() => {popUp.remove();invoker.remove();});
-  await waitForRender();
-  return {popUp,invoker};
-}
-function mouseOver(element) {
-  return (new test_driver.Actions())
-    .pointerMove(0, 0, {origin: element})
-    .send();
-}
-const hoverTime = 200; // TODO(masonf): Once the hover time is CSS-customizable, lower this.
-async function waitForHoverTime() {
-  await new Promise(resolve => step_timeout(resolve,hoverTime));
-  await waitForRender();
-};
-
-["auto","hint","manual"].forEach(type => {
-  promise_test(async (t) => {
-    const {popUp,invoker} = await makePopUpAndInvoker(t,type);
-    assert_false(popUp.matches(':top-layer'));
-    await mouseOver(invoker);
-    assert_false(popUp.matches(':top-layer'));
-    await waitForHoverTime();
-    assert_true(popUp.matches(':top-layer'));
-    popUp.hidePopUp(); // Cleanup
-  },`hoverpopup attribute shows a pop-up with popup=${type}`);
-
-  promise_test(async (t) => {
-    const {popUp,invoker} = await makePopUpAndInvoker(t,type);
-    popUp.showPopUp();
-    assert_true(popUp.matches(':top-layer'));
-    await mouseOver(invoker);
-    assert_true(popUp.matches(':top-layer'));
-    await waitForHoverTime();
-    assert_true(popUp.matches(':top-layer'));
-    popUp.hidePopUp(); // Cleanup
-  },`hoverpopup attribute does nothing when pop-up is already showing (popup=${type})`);
-
-  promise_test(async (t) => {
-    const {popUp,invoker} = await makePopUpAndInvoker(t,type);
-    await mouseOver(invoker);
-    assert_false(popUp.matches(':top-layer'));
-    popUp.remove();
-    await waitForHoverTime();
-    assert_false(popUp.matches(':top-layer'));
-    // Now put it back in the document and make sure it doesn't trigger.
-    document.body.appendChild(popUp);
-    await waitForHoverTime();
-    assert_false(popUp.matches(':top-layer'));
-  },`hoverpopup attribute does nothing when pop-up is moved out of the document (popup=${type})`);
-
-  promise_test(async (t) => {
-    const {popUp,invoker} = await makePopUpAndInvoker(t,type);
-    const {popUp: popUp2, invoker: deleteMe} = await makePopUpAndInvoker(t,type);
-    deleteMe.remove();
-    await mouseOver(invoker);
-    assert_false(popUp.matches(':top-layer'));
-    assert_false(popUp2.matches(':top-layer'));
-    invoker.setAttribute('hoverpopup',popUp2.id); // Reassign
-    await waitForHoverTime();
-    assert_false(popUp.matches(':top-layer'));
-    assert_false(popUp2.matches(':top-layer'));
-  },`hoverpopup attribute does nothing when target changes (popup=${type})`);
-});
-</script>
