v150 · Platform Hygiene · Fonts

Prototype Inspector

Walk the FontFaceSet prototype chain and verify every surface that [LegacyNoInterfaceObject] was hiding: window.FontFaceSet, instanceof checks, constructor.name, and prototype own-property enumeration. Chrome 150 exposes all of these correctly for the first time.

Detecting Chrome version…

document.fonts prototype chain

Own properties on FontFaceSet.prototype

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Worker-side FontFaceSet exposure ([Exposed=(Window,Worker)])

Click to spin up a Worker and probe self.FontFaceSet there.

implementation reference

Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗