Twenty Twenty-Two: H1-H4 font weight isn't rendered correctly if user's PC has Source Serif Pro installed

[zoonini]

Summary

On Windows marchines, the font weight on H1, H2, H2, and H4 blocks does not appear correctly if the user's PC already has the Source Serif Pro font installed (normal weight).

To replicate

• Add Heading tags H1 through H4 on a page (note that H5 & H6 are not affected by this bug)
• View the site on a Windows PC that has the Source Serif Pro font (Regular 400) installed

Result

The headings are too heavy.

Expected

The headings should be lighter than what appears in the browser, as they do on a Mac.

Compare

To compare, view the same page on a PC that does not have Source Serif Pro (Regular 400) installed. The headings appear lighter, the same as they do on a Mac.

Live Test Site

One of the issue's reporters created this test site to illustrate the issue:

​https://zander-test.de/

Testing Conditions

Users report they've tested with:

Windows 10 (Firefox, Chrome, Opera)
Windows 11 (Firefox)

Related forum threads

​https://wordpress.org/support/topic/font-weight-300-is-not-displayed/

​https://wordpress.org/support/topic/heading-weight-default-font-showing-up-differently-on-windows

[zoonini]

too heavy

[zoonini]

correct display

[sabernhardt]

Related: GB42190

[elbsegler]

Addendum from 08/13/2022:
The problem no longer exists in the current versions of the Chrome (104.0.5112.81), Opera (89.0.4447.91) and Edge (104.0.1293.54) browsers.
It persists with the Firefox browser (103.0.2).

[elbsegler]

With Firefox 104 the problem is solved.

[zoonini]

@elbsegler Thanks for the update. Are you still experiencing the issue in browsers other than Firefox? Could you please list the ones where you still see the issue, along with the browser version number? Thanks!

[elbsegler]

@zoonini
I tested it today with a Windows system.
Unfortunately, the error does exist in the Firefox browser. Sorry, my mistake.
Buggy in Firefox 104
Buggy in Firefox Developer 105

But correct in Chromium based browsers. See my entry above.
The problem no longer exists in the current versions of the Chrome (104.0.5112.81), Opera (89.0.4447.91) and Edge (104.0.1293.54) browsers.

[sabernhardt]

I think this was fixed in GB42190 / #57430 for WordPress 6.2. Is that correct?

[zoonini]

Thanks, @sabernhardt

@elbsegler Are you still seeing this bug in WordPress 6.2?