Exposes the width attribute on FontFace and the @font-face font-width descriptor as aliases for stretch and font-stretch. Aligns Chromium with the updated CSS Font Loading and CSS Fonts 4 specifications. Developers can now inspect or initialize font face widths using FontFace.width and CSS font-width interchangeably with stretch and font-stretch.
CSS Font Loading and CSS Fonts 4 define width as the primary FontFace descriptor attribute and @font-face descriptor, while retaining stretch as a legacy alias. Chromium previously ignored the width constructor member and font-width descriptor, causing Web Platform Tests to fail. Exposing width aligns Chromium with the updated specification.