[Webkit-unassigned] [Bug 209486] Very noticeable flickering in a scrolling iframe with horizontal overflow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209486

Justin Ridgewell <jridgewell at google.com> changed:

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                 CC|                            |jridgewell at google.com

--- Comment #2 from Justin Ridgewell <jridgewell at google.com> ---
> I cannot reproduce this with iOS 13.4 (released today).

Flicker is better, but the scroll behavior still seems wrong. Normally, vertical scrolling will lock the horizontal position (unless you start the scroll by going diagonal, then both directions are unlocked). Iframe scrolling never scroll locks, so we get free movement in both directions. It feels unnatural.

Here's a video recording with 13.4: https://drive.google.com/file/d/1SWnE8z_l2FPkBgBOip1vEz1nPo5ed6bH/view?usp=sharing

> But also, the page appears to look and behave very differently than on the video.

I had paint flashing enabled when recording, if you're referring to the red flashes.

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