H3 and H4 section headings are hard to tell apart

[bsmth]

Summary

The font sizes of <h3> and <h4> elements are quite similar. It's hard to tell if a section is a subsection or not based on styling.

There is a difference in font size, but if both titles are capitalized, it's tough to tell them apart.

URL

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/105#apis

Reproduction steps

1. Go to https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/105#apis
2. See APIs (h3) and DOM (h4)

Expected behavior

I can tell that "DOM" is a subsection of "APIs".

Actual behavior

The font sizes look very similar:

• APIs - 27.648px (1.17em)
• DOM - 23.04px (1em)

Device

Desktop

Browser

Firefox

Browser version

Stable

Operating system

Mac OS

Screenshot

Anything else?

No response

Validations

• [X] I have read the Community Participation Guidelines.
• [X] I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.