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add_task(async function () {
const kPrefName_AutoScroll = "general.autoScroll";
Services.prefs.setBoolPref(kPrefName_AutoScroll, false);
let dataUri =
'data:text/html,<html><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
<iframe id="iframe" style="display: none;"></iframe>\
</body></html>';
let loadedPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
BrowserTestUtils.startLoadingURIString(gBrowser, dataUri);
await loadedPromise;
await BrowserTestUtils.synthesizeMouse(
"#i",
50,
50,
{ button: 1 },
gBrowser.selectedBrowser
);
await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async function () {
var iframe = content.document.getElementById("iframe");
if (iframe) {
var e = new iframe.contentWindow.PageTransitionEvent("pagehide", {
bubbles: true,
cancelable: true,
persisted: false,
});
iframe.contentDocument.dispatchEvent(e);
iframe.contentDocument.documentElement.dispatchEvent(e);
}
});
await BrowserTestUtils.synthesizeMouse(
"#i",
100,
100,
{ type: "mousemove", clickCount: "0" },
gBrowser.selectedBrowser
);
// If scrolling didn't work, we wouldn't do any redraws and thus time out, so
// request and force redraws to get the chance to check for scrolling at all.
await new Promise(resolve => window.requestAnimationFrame(resolve));
let msg = await SpecialPowers.spawn(
gBrowser.selectedBrowser,
[],
async function () {
// Skip the first animation frame callback as it's the same callback that
// the browser uses to kick off the scrolling.
return new Promise(resolve => {
function checkScroll() {
let msg = "";
let elem = content.document.getElementById("i");
if (elem.scrollTop != 0) {
msg += "element should not have scrolled vertically";
}
if (elem.scrollLeft != 0) {
msg += "element should not have scrolled horizontally";
}
resolve(msg);
}
content.requestAnimationFrame(checkScroll);
});
}
);
ok(!msg, "element scroll " + msg);
// restore the changed prefs
if (Services.prefs.prefHasUserValue(kPrefName_AutoScroll)) {
Services.prefs.clearUserPref(kPrefName_AutoScroll);
}
// wait for focus to fix a failure in the next test if the latter runs too soon.
await SimpleTest.promiseFocus();
});
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