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-rw-r--r--layout/base/tests/browser_bug1791083.js81
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diff --git a/layout/base/tests/browser_bug1791083.js b/layout/base/tests/browser_bug1791083.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL =
+ "data:text/html," +
+ "<style> a:hover {background-color: black}</style>" +
+ "<body style='width:100px;height:100px'>" +
+ "<a href='http://www.example.com'>Click Me</a>" +
+ "</body>";
+
+function isAnchorHovered(win) {
+ return SpecialPowers.spawn(
+ win.gBrowser.selectedBrowser,
+ [],
+ async function () {
+ const a = content.document.querySelector("a");
+ return a.matches(":hover");
+ }
+ );
+}
+
+add_task(async function test() {
+ let newWin = await BrowserTestUtils.openNewBrowserWindow();
+
+ // This bug is only reproducible if the cursor is out of the viewport, so
+ // we resize the window to ensure the cursor is out of the viewport.
+
+ // SynthesizeMouse isn't sufficient because it only synthesizes
+ // mouse events without actually moving the cursor permanently to a
+ // new location.
+ newWin.resizeTo(50, 50);
+
+ BrowserTestUtils.loadURIString(newWin.gBrowser.selectedBrowser, URL);
+ await BrowserTestUtils.browserLoaded(newWin.gBrowser.selectedBrowser);
+
+ await SpecialPowers.spawn(
+ newWin.gBrowser.selectedBrowser,
+ [],
+ async function () {
+ const a = content.document.querySelector("a");
+ await EventUtils.synthesizeMouseAtCenter(
+ a,
+ { type: "mousemove" },
+ content
+ );
+ }
+ );
+
+ // We've hovered the anchor element.
+ let anchorHovered = await isAnchorHovered(newWin);
+ ok(anchorHovered, "Anchor should be hovered");
+
+ let locationChange = BrowserTestUtils.waitForLocationChange(newWin.gBrowser);
+
+ // Click the anchor to navigate away
+ await SpecialPowers.spawn(
+ newWin.gBrowser.selectedBrowser,
+ [],
+ async function () {
+ const a = content.document.querySelector("a");
+ await EventUtils.synthesizeMouseAtCenter(
+ a,
+ { type: "mousedown" },
+ content
+ );
+ await EventUtils.synthesizeMouseAtCenter(a, { type: "mouseup" }, content);
+ }
+ );
+ await locationChange;
+
+ // Navigate back to the previous page which has the anchor
+ locationChange = BrowserTestUtils.waitForLocationChange(newWin.gBrowser);
+ newWin.gBrowser.selectedBrowser.goBack();
+ await locationChange;
+
+ // Hover state should be cleared upon page caching.
+ anchorHovered = await isAnchorHovered(newWin);
+ ok(!anchorHovered, "Anchor should not be hovered");
+
+ BrowserTestUtils.closeWindow(newWin);
+});