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diff --git a/dom/base/test/file_suppressed_events_top_modalstate.html b/dom/base/test/file_suppressed_events_top_modalstate.html
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+++ b/dom/base/test/file_suppressed_events_top_modalstate.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test event suppression</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/paint_listener.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div>Top</div>
+<script type="application/javascript">
+
+function waitForMessage(aMsg, aCallback) {
+ window.addEventListener("message", function handler(e) {
+ if (e.data != aMsg) {
+ return;
+ }
+
+ info(`received: ${e.data}`);
+ window.removeEventListener("message", handler);
+ if (aCallback) {
+ aCallback(e);
+ }
+ });
+}
+
+function waitForClickEvent(aElement, aWindow) {
+ return new Promise((aResolve) => {
+ aElement.addEventListener("click", aResolve, { once: true });
+ synthesizeMouseAtCenter(aElement, { type: "mousedown" }, aWindow);
+ synthesizeMouseAtCenter(aElement, { type: "mouseup" }, aWindow);
+ });
+}
+
+waitForMessage("ready", async function(e) {
+ await waitUntilApzStable();
+
+ let innerWin = e.source;
+ let innerDiv = innerWin.document.querySelector("div");
+
+ let eventCount = 0;
+ innerDiv.addEventListener("mousemove", function() {
+ eventCount++;
+ });
+
+ // Test that event handling is suppressed.
+ let utils = SpecialPowers.getDOMWindowUtils(window);
+ utils.enterModalState();
+ const TOTAL = 100;
+ for (let i = 0; i < TOTAL; i++) {
+ synthesizeMouseAtCenter(innerDiv, { type: "mousemove" }, innerWin);
+ }
+ utils.leaveModalState();
+
+ // Wait for click event to ensure we have received all mousemove events.
+ await waitForClickEvent(innerDiv, innerWin);
+ opener.info(`eventCount: ${eventCount}`);
+ opener.ok(eventCount < TOTAL, "event should be suspressed");
+
+ // Test that event handling is not suppressed.
+ eventCount = 0;
+ for (let i = 0; i < TOTAL; i++) {
+ synthesizeMouseAtCenter(innerDiv, { type: "mousemove" }, innerWin);
+ }
+
+ // Wait for click event to ensure we have received all mousemove events.
+ await waitForClickEvent(innerDiv, innerWin);
+ opener.info(`eventCount: ${eventCount}`);
+ opener.is(eventCount, TOTAL, "event should not be suspressed");
+
+ opener.postMessage("done", "*");
+});
+
+</script>
+<iframe src="http://example.org/tests/dom/base/test/file_suppressed_events_middle.html"></iframe>
+</body>
+</html>