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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";
const PAGECONTENT =
"<!DOCTYPE html>" +
"<html>" +
"<style>" +
"html { " +
" height: 120vh;" +
" overflow-y: scroll;" +
"}" +
"</style>" +
"</html>";
const pageUrl = "data:text/html," + encodeURIComponent(PAGECONTENT);
add_task(async function test() {
if (window.devicePixelRatio == 1) {
ok(
true,
"Skip this test since this test is supposed to run on HiDPI mode, " +
"the devixePixelRato on this machine is " +
window.devicePixelRatio
);
return;
}
const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
// Scroll the content a bit.
const originalScrollPosition = await SpecialPowers.spawn(
tab.linkedBrowser,
[],
async () => {
content.document.scrollingElement.scrollTop = 100;
return content.document.scrollingElement.scrollTop;
}
);
// Disabling HiDPI mode and check the scroll position.
SpecialPowers.DOMWindowUtils.setHiDPIMode(false);
// Make sure we restore even if this test failed.
registerCleanupFunction(() => {
SpecialPowers.DOMWindowUtils.restoreHiDPIMode();
});
const scrollPosition = await SpecialPowers.spawn(
tab.linkedBrowser,
[],
async () => {
return content.document.scrollingElement.scrollTop;
}
);
is(
originalScrollPosition,
scrollPosition,
"The scroll position should be kept"
);
BrowserTestUtils.removeTab(tab);
});
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