Chrome Version       : 69.0.3497.100
OS Version           : Linux, Windows
URLs (if applicable) : https://www.reddit.com/r/Economics/comments/9llxsf/job_growth_slumps_in_september_but_unemployment/
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari:
    Firefox: OK
    IE/Edge: OK

What steps will reproduce the problem?
1. Visit a Reddit comment page with a lot of comments
2. Scroll around for a while.

What is the expected result?
No regions of missing content.

What happens instead of that?
Sometimes I see rectangular "bands" of missing content (see screenshot).

I have observed this several times over the last few weeks on both Linux and Windows.  It happens fairly often, but it's not consistently reproducible.  I haven't seen it on other websites.

Reddit comment pages have a large <div> scroller with forced compositing (#overlayScrollContainer).  The blank regions draw the solid background color behind the scroller, as if this <div> were hidden.

Mousing over the blank regions often makes parts of the content reappear, in chunks that look to be about the size of compositor tiles.  The page is otherwise responsive.

The contents of chrome://gpu are attached.

Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
 

Deleted: screenshot.png 361 KB

	screenshot.png 361 KB View Download

Deleted: gpu.txt 19.4 KB

gpu.txt 19.4 KB View Download