[Pikamander2]

This one's niche, but Firefox's dev tools also let web developers see which font is actually being used. Chrome's dev tools only show you what font is supposed to be in use, but doesn't tell you if it had to resort to a fallback font.

[lieuwex]

Are you sure? I think the computed tab in Chrome devtools shows the actual used font.

[hrldcpr]

Yup if you scroll to the bottom of the Computed tab, it shows the "Rendered Fonts".