[css-font-display][css-font-loading] FontFace.status for font faces in the failure period

[irori]

When a font face enters the failure period, it’s marked as a failed load and cause normal font fallback, but it may still be loading. Should the status attribute of the FontFace remain "loading", or set to "error"?

[tabatkins]

I think it should stay "loading". We probably want to expose a boolean on the font as to whether it's being treated as failed, tho. That's orthogonal to the question of whether it loaded.

[irori]

OK, then...

• It becomes "error" if the user agent chose to abort the download
• It becomes "loaded" when the continued download finishes
  • FontFaceSet.ready remains unresolved until then
  • FontFaceSet.check() may return true for such "loaded" font faces

Do all these sound correct?

[tabatkins]

• It becomes "error" if the user agent chose to abort the download
• It becomes "loaded" when the continued download finishes
  • FontFaceSet.ready remains unresolved until then

Yes to these three.

• FontFaceSet.check() may return true for such "loaded" font faces

I don't think we want this. We probably want the "check" algo to pay attention to whether the font is treated as failed.

[KenjiBaheux]

@irori do we need to fix anything in our implementation?
cc/ @tabatkins

[irori]

I don't think we want this. We probably want the "check" algo to pay attention to whether the font is treated as failed.

We need to fix this point. Blink returns true for document.fonts.check('10px optional-font-in-failure-period').
(FWIW, Firefox returns true for this too.)

[KenjiBaheux]

Filed http://crbug.com/681440 for the comment above.