fontPreloading check erroneously advises to preload a font which is a data: URL #1185
Description
When running Pixi on https://www.cu-camper.com/en/ I saw unexpected advice for Preload critical fonts:
Namely, the font is present on the page as a data: URL and thus it is irrelevant for preloading.
Interestingly, the font in question is coming from a page inside of an amp-iframe: https://cumagazin.cu-camper.com/en/magazine/map/?center=41.4825133,2.4863493&zoom=2&lightbox=1&language=en
I believe the logic here should be changed:
amp-toolbox/packages/page-experience/lib/checks/fontPreloading.js
Lines 25 to 28 in 42ff00a
Namely to something like:
if (!fontface || !fontface.mainSrc || fontface.mainSrc.startsWith('data:')) {