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diff --git a/testing/web-platform/tests/html/semantics/invokers/interesttarget-anchor-event-dispatch.tentative.html b/testing/web-platform/tests/html/semantics/invokers/interesttarget-anchor-event-dispatch.tentative.html
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+++ b/testing/web-platform/tests/html/semantics/invokers/interesttarget-anchor-event-dispatch.tentative.html
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+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<meta name="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<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/invoker-utils.js"></script>
+
+<div id="interestee"></div>
+<a href="/" id="interestanchor" interesttarget="interestee">Anchor</a>
+<button id="otherbutton">Other Button</button>
+
+<script>
+  promise_test(async function (t) {
+    t.add_cleanup(() => otherbutton.focus());
+    let event = null;
+    interestee.addEventListener("interest", (e) => (event = e), { once: true });
+    interestanchor.focus();
+    assert_true(event instanceof InterestEvent, "event is InterestEvent");
+    assert_equals(event.type, "interest", "type");
+    assert_equals(event.bubbles, false, "bubbles");
+    assert_equals(event.composed, true, "composed");
+    assert_equals(event.isTrusted, true, "isTrusted");
+    assert_equals(event.action, "", "action");
+    assert_equals(event.target, interestee, "target");
+    assert_equals(event.invoker, interestanchor, "invoker");
+  }, "InterestEvent dispatches on anchor focus");
+
+  promise_test(async function (t) {
+    t.add_cleanup(() => otherbutton.focus());
+    let event = null;
+    interestee.addEventListener("interest", (e) => (event = e), { once: true });
+    await hoverOver(interestanchor);
+    assert_true(event instanceof InterestEvent, "event is InterestEvent");
+    assert_equals(event.type, "interest", "type");
+    assert_equals(event.bubbles, false, "bubbles");
+    assert_equals(event.composed, true, "composed");
+    assert_equals(event.isTrusted, true, "isTrusted");
+    assert_equals(event.action, "", "action");
+    assert_equals(event.target, interestee, "target");
+    assert_equals(event.invoker, interestanchor, "invoker");
+  }, "InterestEvent dispatches on anchor hover");
+</script>