Bug 203768

Summary:

Safari/WebKit not rendering glyph substitution (GSUB) correctly in variable fonts

Product:

WebKit

Reporter:

Stephen Nixon <arrowtypeco>

Component:

Text

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Normal

CC:

mmaxfield

Priority:

Version:

Safari Technology Preview

Hardware:

All

OS:

All

Attachments:

Description	Flags
screenshot of website demonstrating Safari mishandling GSUB in variable font	none

Stephen Nixon

Reported 2019-11-01 15:22:55 PDT

Created attachment 382639 [details] screenshot of website demonstrating Safari mishandling GSUB in variable font Interactive HTML bug report: https://arrowtype.github.io/recursive/gsub-bug-and-hack_fix-safari/index.html --- Summary: Glyph substitution (GSUB) in variable fonts occurs when a character's shape is changed in a non-compatible way. Put simply, GSUB is when shape changes dramatically, rather than gradually, along an axis. GSUB does work with multiple characters, BUT it fails if a string contains only one character. This behavior is problematic for any websites that are demonstrating font design, or in any user-editable text field that may have 1 character at any given time, which may require GSUB to be activated to correct display. As of Nov 1, 2019, this test fails in: • Safari on macOS, Version 12.1.1 (14607.2.6.1.1) • Safari Technology Preview, Release 95 (Safari 13.1, WebKit 14609.1.7) • Safari in iOS 13.1.3

Attachments
screenshot of website demonstrating Safari mishandling GSUB in variable font (257.73 KB, image/png) 2019-11-01 15:22 PDT, Stephen Nixon	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Myles C. Maxfield

Comment 1 2019-11-01 15:51:24 PDT

*** This bug has been marked as a duplicate of bug 186804 ***

Stephen Nixon

Comment 2 2019-11-02 09:18:33 PDT

Thanks for sorting this as a duplicate, Myles! Good to realize you already knew about it.

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