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 * in the documentation and/or other materials provided with the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-interface

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

// TODO(philipj): This interface should be [Exposed=Window,Worker] and should
// have a constructor, and thus not have [NoInterfaceObject].
[
    ActiveDOMObject,
    SetWrapperReferenceFrom=document,
    NoInterfaceObject,
] interface FontFaceSet : EventTarget {
    // TODO(ksakamoto): Make FontFaceSet Set-like. crbug.com/392075
    // setlike<FontFace>;
    void forEach(FontFaceSetForEachCallback callback, optional any thisArg);
    [RaisesException] boolean has(FontFace fontFace);
    readonly attribute unsigned long size;
    // TODO(philipj): add() should return the FontFaceSet.
    [RaisesException] void add(FontFace fontFace);
    [RaisesException, ImplementedAs=remove] boolean delete(FontFace fontFace);
    void clear();

    // 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;
};
