Bug 1554572 Comment 0 Edit History

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STR:
 1. Load this article:
http://www.bbc.com/future/story/20190514-the-global-internet-is-disintegrating-what-comes-next
(Other BBC articles trigger this too, e.g. [this one](http://www.bbc.com/future/story/20190116-a-high-carb-diet-may-explain-why-okinawans-live-so-long)

2. Scroll down several times with "pagedown" key or spacebar.

ACTUAL RESULTS:
Once the first image is visible (photo of a crowd and someone holding a "Putin Net" sign), subsequent pagedown actions only scroll down a few pixels.

EXPECTED RESULTS:
These pagedown keypresses should continue scrolling a full page down.

Firefox Nightly 69.0a1 (2019-05-26) gives ACTUAL RESULTS.
Chrome 74 gives EXPECTED RESULTS. (Though if I use downarrow to scroll, I do notice that the scrolling slows down a bit when the photo comes into view. But pagedown/spacebar work just fine in Chrome, scrolling a full page.)


The issue goes away if I set `layout.css.scroll-anchoring.enabled`, so this is scroll anchoring intervening in the scroll behavior.
STR:
 1. Load this article:
http://www.bbc.com/future/story/20190514-the-global-internet-is-disintegrating-what-comes-next
(Other BBC articles trigger this too, e.g. [this one](http://www.bbc.com/future/story/20190116-a-high-carb-diet-may-explain-why-okinawans-live-so-long).)

2. Scroll down several times with "pagedown" key or spacebar.

ACTUAL RESULTS:
Once the first image is visible (photo of a crowd and someone holding a "Putin Net" sign), subsequent pagedown actions only scroll down a few pixels.

EXPECTED RESULTS:
These pagedown keypresses should continue scrolling a full page down.

Firefox Nightly 69.0a1 (2019-05-26) gives ACTUAL RESULTS.
Chrome 74 gives EXPECTED RESULTS. (Though if I use downarrow to scroll, I do notice that the scrolling slows down a bit when the photo comes into view. But pagedown/spacebar work just fine in Chrome, scrolling a full page.)


The issue goes away if I set `layout.css.scroll-anchoring.enabled`, so this is scroll anchoring intervening in the scroll behavior.

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