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FontFaceSet

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The FontFaceSet interface of the CSS Font Loading API manages the loading of font-faces and querying of their download status.

FontFaceSet.status Read only: Indicates the font-face's loading status. It will be one of 'loading' or 'loaded'.

FontFaceSet.onloading: An EventListener called whenever an event of type loading is fired, indicating a font-face set has started loading.
FontFaceSet.onloadingdone: An EventListener called whenever an event of type loadingdone is fired, indicating that a font face set has finished loading.
FontFaceSet.onloadingerror: An EventListener called whenever an event of type loadingerror is fired, indicating that an error occurred whilst loading a font-face set.

FontFaceSet.add(): Adds a font to the font set.
FontFaceSet.check(): A Boolean that indicates whether a font is loaded, but doesn't initiate a load when it isn't.
FontFaceSet.clear(): Removes all fonts from the font set.
FontFaceSet.delete(): Removes a font from the font set.
FontFaceSet.load(): Returns a Promise which resolves to a list of font-faces for a requested font.
FontFaceSet.ready(): Returns a Promise which resolves once font loading and layout operations have completed.

Specification	Status	Comment
CSS Font Loading Module Level 3 The definition of 'FontFaceSet' in that specification.	Working Draft	Initial definition

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https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet