Bug 25818

Summary: Regression: WebKit misrenders line-height for Thai letters
Product: WebKit Reporter: Kridsada Thanabulpong <sirn>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED CONFIGURATION CHANGED    
Severity: Normal CC: ahmad.saleem792, ap, bfulgham, mitz, rniwa, simon.fraser
Priority: P2 Keywords: HasReduction, InRadar
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.5   
Attachments:
Description Flags
The error.
none
Testcase. none

Kridsada Thanabulpong
Reported 2009-05-15 03:34:11 PDT
r43758 build of WebKit did not properly render Thai letters to baseline grid. It used to work fine until the very recent WebKit builds and in Safari 4 Public Beta. (See attachment)
Attachments
The error. (94.89 KB, image/png)
2009-05-15 03:36 PDT, Kridsada Thanabulpong 		no flags
Details
Testcase. (2.03 KB, text/html)
2009-05-15 03:39 PDT, Kridsada Thanabulpong 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Kridsada Thanabulpong
Comment 1 2009-05-15 03:36:25 PDT
Created attachment 30380 [details] The error.
Kridsada Thanabulpong
Comment 2 2009-05-15 03:39:08 PDT
Created attachment 30381 [details] Testcase.
Mark Rowe (bdash)
Comment 3 2009-05-15 06:17:47 PDT
<rdar://problem/6891494>
mitz
Comment 4 2009-05-17 00:51:01 PDT
The primary font (Helvetica 13px) has a 12px ascent and a 3px descent; the fallback font (Thonburi 13px) has a 14px descent and a 3px descent. For 18px line-spacing, Helvetica gets an extra pixel above and two extra pixels below, and Thonburi gets one pixel below. Combined, that's 14px above the baseline and 5px below the baseline for a total height of 19px.
Ahmad Saleem
Comment 5 2022-07-22 11:17:31 PDT
I am unable to reproduce this bug of line height on attached test case in reference to attached screenshot of "Webkit" rendering. Safari 15.6 on macOS 12.5 matches with other browsers (Chrome Canary 105 and Firefox Nightly 104) on attached test case. If I am testing incorrectly, please ignore my comment. Thanks!
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