Bug 242189

Summary:

Support subpixel precision in pageX, pageY and scrollTop

Product:

WebKit

Reporter:

Oleguer Llopart <oleguer.llopart.mora>

Component:

UI Events

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

a_protyasha, dino, graouts, simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 15

Hardware:

iPhone / iPad

OS:

iOS 15

URL:

https://ollm.dev/pagex/pagex.html

See Also:

https://bugs.webkit.org/show_bug.cgi?id=234360

Attachments:

Description	Flags
Subpixels in Chrome Android	none

Description Oleguer Llopart 2022-06-30 07:12:20 PDT

Created attachment 460580 [details]
Subpixels in Chrome Android

Example URL:
https://ollm.dev/pagex/pagex.html

Safari currently returns integer values in pageX, pageY, scrollTop, clientX, etc in safari for iOS (I haven't tested it in safari for macOS), this causes transitions that depend on these properties to look rough, especially the more DPI the device has. Currently chrome for Android already supports subpixiles for pageX, pageY, scrollTop, etc.

Example video in Safari iOS: https://drive.google.com/file/d/1snoRR0diab9nZ_jU2a6i-bBUcSvMGo-e/view?usp=sharing

Example video in Chrome Android: https://drive.google.com/file/d/1RBj6Ae1A-xNeKwPVQnDZzbcLn3-y2EtQ/view?usp=sharing

Comment 1 Radar WebKit Bug Importer 2022-07-07 07:13:13 PDT

<rdar://problem/96595261>