1754948 - Incorrect font rendering at bold weights

Status: RESOLVED DUPLICATE of bug 1587094

(Core :: Layout: Text and Fonts, defect)

Description

[jokelaromi]

Attachment: font rendering comparison between Firefox 98 and Microsoft Edge

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:98.0) Gecko/20100101 Firefox/98.0

Steps to reproduce:

1. Navigate to a page that uses some regular weight fonts at a font weight higher than 600
2. Observe font rendering

Actual results:

In the two example sites that I observed, a Blender press release using "Heebo Regular" at font weight 700 causes artifacting in upper case B's and W's, and lowercase v's
(https://www.blender.org/press/apple-joins-blender-development-fund/)
A product page for "Ink" using the font Muli Light has artifacting in lower case y's in elements at weight 700
(https://www.inklestudios.com/ink/)

Expected results:

The fonts should apply the synthetic bolding evenly, as shown in the attached comparison with Firefox on the left, and Edge on the right

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Layout: Text and Fonts' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Jonathan Kew [:jfkthame]]

This is a DirectWrite issue, as described in bug 1587094. (Firefox 99 will include a workaround to avoid the ugly result seen here.)