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CSS Font Loading API

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

The CSS Font Loading API provides events and interfaces for dynamically loading font resources.

FontFace: Represents a single usable font face.
FontFaceSet: An interface loading font faces and checking their download statuses.
FontFaceSource: An mixing providing all of the fonts used in font-related operations, unless defined otherwise. It defines the FontFaceSources.fonts property available to Document and WorkerGlobalScope.
FontFaceSetLoadEvent: Fired whenever a FontFaceSet loads.

Specification	Status	Comment
CSS Font Loading Module Level 3	Working Draft	Initial definition.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	35.0	41 (41)	?	22	10

Feature	Android Webview	Chrome for Android	Firefox Mobile (Gecko)	Firefox OS	IE Mobile	Opera Mobile	Safari Mobile
Basic support	56.0	35.0	41.0 (41)	?	?	22	10

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