Bug 286256

Summary:

Inconsistent Rendering of 0.2px Borders

Product:

WebKit

Reporter:

edokeh

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

ap, bfulgham, karlcow, simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 18

Hardware:

iPhone / iPad

OS:

All

Attachments:

Description	Flags
subpixel-border-not-render	none
rendering on an iPhone	none

edokeh

Reported 2025-01-20 04:00:26 PST

Created attachment 473953 [details] subpixel-border-not-render ## Summary Inconsistent rendering of 0.2px border-top property in WebKit. Specific div elements (33rd, 97th, and 161st) fail to render their border-top while identical neighboring elements render correctly. ## Steps to Reproduce Open the attached test case HTML file in iOS Safari ## Test Configuration OS: iOS16, 17, 18 Hardware: iPhone 14/15/16

Attachments
subpixel-border-not-render (10.46 KB, text/html) 2025-01-20 04:00 PST, edokeh	no flags	Details
rendering on an iPhone (515.46 KB, image/jpeg) 2025-04-10 15:36 PDT, Karl Dubost	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Alexey Proskuryakov

Comment 1 2025-01-20 16:16:12 PST

I can reproduce on iPhone 16 Pro.

Radar WebKit Bug Importer

Comment 2 2025-01-27 04:01:36 PST

<rdar://problem/143686503>

Simon Fraser (smfr)

Comment 3 2025-04-10 08:12:19 PDT

I cannot reproduce on STP 215 on a 2x display, so this is probably specific to 3x displays.

Karl Dubost

Comment 4 2025-04-10 15:36:17 PDT

Created attachment 474885 [details] rendering on an iPhone

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