Read more on MDN
let load: WebAPI.CSSFontLoadingAPI.fontFace => Promise.t< WebAPI.CSSFontLoadingAPI.fontFace,>
let make: ( ~family: string, ~source: string, ~descriptors: WebAPI.CSSFontLoadingAPI.fontFaceDescriptors=?,) => WebAPI.CSSFontLoadingAPI.fontFace
let make2: ( ~family: string, ~source: DataView.t, ~descriptors: WebAPI.CSSFontLoadingAPI.fontFaceDescriptors=?,) => WebAPI.CSSFontLoadingAPI.fontFace
let make3: ( ~family: string, ~source: ArrayBuffer.t, ~descriptors: WebAPI.CSSFontLoadingAPI.fontFaceDescriptors=?,) => WebAPI.CSSFontLoadingAPI.fontFace