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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at
* The origin of this IDL file is
* Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
* liability, trademark and document use rules apply.
typedef (ArrayBuffer or ArrayBufferView) BinaryData;
dictionary FontFaceDescriptors {
UTF8String style = "normal";
UTF8String weight = "normal";
UTF8String stretch = "normal";
UTF8String unicodeRange = "U+0-10FFFF";
UTF8String variant = "normal";
UTF8String featureSettings = "normal";
[Pref="layout.css.font-variations.enabled"] UTF8String variationSettings = "normal";
UTF8String display = "auto";
UTF8String ascentOverride = "normal";
UTF8String descentOverride = "normal";
UTF8String lineGapOverride = "normal";
[Pref="layout.css.size-adjust.enabled"] UTF8String sizeAdjust = "100%";
enum FontFaceLoadStatus { "unloaded", "loading", "loaded", "error" };
interface FontFace {
constructor(UTF8String family,
(UTF8String or BinaryData) source,
optional FontFaceDescriptors descriptors = {});
[SetterThrows] attribute UTF8String family;
[SetterThrows] attribute UTF8String style;
[SetterThrows] attribute UTF8String weight;
[SetterThrows] attribute UTF8String stretch;
[SetterThrows] attribute UTF8String unicodeRange;
[SetterThrows] attribute UTF8String variant;
[SetterThrows] attribute UTF8String featureSettings;
[SetterThrows, Pref="layout.css.font-variations.enabled"] attribute UTF8String variationSettings;
[SetterThrows] attribute UTF8String display;
[SetterThrows] attribute UTF8String ascentOverride;
[SetterThrows] attribute UTF8String descentOverride;
[SetterThrows] attribute UTF8String lineGapOverride;
[SetterThrows, Pref="layout.css.size-adjust.enabled"] attribute UTF8String sizeAdjust;
readonly attribute FontFaceLoadStatus status;
Promise<FontFace> load();
readonly attribute Promise<FontFace> loaded;