[Webkit-unassigned] [Bug 244381] New: [iOS] Scrolling artifacts using fixed divs and lvh units

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244381

            Bug ID: 244381
           Summary: [iOS] Scrolling artifacts using fixed divs and lvh
                    units
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonlee554 at gmail.com
                CC: simon.fraser at apple.com

iOS 15.6.1, scroll the home page https://greermuldowney.com

there is this markup:

<div id="background" style="background-image:...; position: fixed; width: 100%; height: 100lvh; top: 0; left: 0;"></div>
<div id="overlay" style="-webkit-backdrop-blur:...; position: fixed; width: 100%; height: 100lvh; top: 0; left: 0;"></div>

[I currently use backdrop blur because blurring the background image directly creates a halo around the viewport. Even with this solution I still see a halo on the bottom edge in iOS Safari.]

Scroll down. While in momentum, the bottom chunk is white, and then at some point the rest of the image comes in. Fingers down scrolling, I see the image filling out the viewport dynamically initially.

I see similar behavior in both Tab Bar and Single Tab modes.

With layer borders on it seems like the div is not sized to "100lvh" but is sized more like "100dvh". I would have expected lvh to not change between the two bar states.

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