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 * modification, are permitted provided that the following conditions are
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface

enum FontFaceSetLoadStatus { "loading", "loaded" };

// TODO(foolip): This interface should be [Exposed=Window,Worker] and should
// have a constructor, and thus not have [NoInterfaceObject].
[
    DependentLifetime,
    NoInterfaceObject
] interface FontFaceSet : EventTarget {
    setlike<FontFace>;

    // events for when loading state changes
    attribute EventHandler onloading;
    attribute EventHandler onloadingdone;
    attribute EventHandler onloadingerror;

    // check and start loads if appropriate
    // and fulfill promise when all loads complete
    [CallWith=ScriptState] Promise<sequence<FontFace>> load(DOMString font, optional DOMString text = " ");

    // return whether all fonts in the fontlist are loaded
    // (does not initiate load if not available)
    [RaisesException] boolean check(DOMString font, optional DOMString text = " ");

    // async notification that font loading and layout operations are done
    [CallWith=ScriptState] readonly attribute Promise<FontFaceSet> ready;

    // loading state, "loading" while one or more fonts loading, "loaded" otherwise
    readonly attribute FontFaceSetLoadStatus status;
};