Tested on windows 7 , mac os 10.12.2 and ubuntu 14.04 on chrome canary M58 #58.0.3015.0/3014.0 , chrome stable M56 #56.0.2924.87 and issue is reproduced.

Attached screencast for reference.

Issue is seen from M40 #40.0.2172.0 and is a non-regression issue.

Marking it as untraiged , for further inputs.

Thanks!

This, like so much else wrong with fullscreen, would be helped by fixing  issue 240576 . There's currently code in FullscreenController::didEnterFullscreen() which resets the page scale factor, scroll position, and viewport offset when entering fullscreen and code to restore it when exiting fullscreen.

Because <dialog> works even when the page is scrolled, I believe that once Fullscreen uses top layer, at least the scroll position bits could be removed. Therefore marked as blocked.

Adding Hotlist-Interop because "It works fine in Firefox and IE/Edge."

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0de9638b5d008eb11b206187bf90a70bbf23857a

commit 0de9638b5d008eb11b206187bf90a70bbf23857a
Author: Dave Tapuska <dtapuska@chromium.org>
Date: Wed Aug 29 15:08:54 2018

Avoid scrolling when entering fullscreen

When entering fullscreen we shouldn't need to set scroll to 0,0. This
fixes fullscreening an element that has scroll offset.

BUG= 693075 , 684920 

Change-Id: I2acf27eb2641731d580865d38e1a1495f6aee7de
Reviewed-on: https://chromium-review.googlesource.com/1191664
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587120}
[add] https://crrev.com/0de9638b5d008eb11b206187bf90a70bbf23857a/third_party/WebKit/LayoutTests/external/wpt/fullscreen/rendering/fullscreen-root-block-scroll-manual.html
[modify] https://crrev.com/0de9638b5d008eb11b206187bf90a70bbf23857a/third_party/blink/renderer/core/frame/fullscreen_controller.cc