[css-fonts] Handling of @font-face rule which lacks font-family or src descriptor #1133
Description
The spec currently says:
@font-facerules require a font-family and src descriptor; if either of these are missing, the @font-face rule is invalid and must be ignored entirely.
It defines a @font-face rule to be invalid if either font-family or src descriptor is missing, but it is not clear what does "ignore entirely" mean here. It could mean:
- the rule should be rejected by the parser like a syntax error, or
- the rule should be parsed, but ignored for font matching.
Currently in all modern browsers, it is handled in the second approach (that is, invalid rules are NOT rejected by the parser), but the spec should really make it clear.