Bug 244179 - Background-size incorrectly gets rounded to device pixel
Summary: Background-size incorrectly gets rounded to device pixel
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: BrowserCompat, CanvaBug, InRadar
Depends on:
Blocks:
 
Reported: 2022-08-21 20:22 PDT by Xidorn Quan
Modified: 2022-08-21 23:53 PDT (History)
6 users (show)

See Also:

Attachments
testcase (307 bytes, text/html)
2022-08-21 20:22 PDT, Xidorn Quan 		no flags Details
rendering in Safari, firefox, chrome (39.55 KB, image/png)
2022-08-21 23:52 PDT, Karl Dubost 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Xidorn Quan 2022-08-21 20:22:04 PDT 
Created attachment 461783 [details]
testcase

See the attached testcase.

Expected result:

The container is 98x98, and background-size is 12.25x12.25, so it should have just 8x8 dots in the container, and since its position is center, it should have half dots on all edges. Seemingly it's rounding to 12.5px for me.

Actual result:

The dots on right and bottom are much smaller than half.

Both Firefox and Chrome have the right result.
Comment 1 Karl Dubost 2022-08-21 23:52:34 PDT 
Created attachment 461791 [details]
rendering in Safari, firefox, chrome

Rendering in 
Safari 16.1
Firefox Nightly 105.0a1
Google Chrome Canary 107.0.5253.0
Comment 2 Radar WebKit Bug Importer 2022-08-21 23:53:01 PDT 
<rdar://problem/98962915>