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-rw-r--r--layout/base/tests/browser_bug1757410.js62
1 files changed, 62 insertions, 0 deletions
diff --git a/layout/base/tests/browser_bug1757410.js b/layout/base/tests/browser_bug1757410.js
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+++ b/layout/base/tests/browser_bug1757410.js
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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);
+});