According to a support document, Google will discontinue Gmail's Basic HTML view in January 2024. Everyone who currently uses the Basic HTML mode will be forced to adopt the Standard view. This is a disappointing change of pace, as Basic HTML mode provided a lightweight and old-school design that some users preferred. And, unlike the standard Gmail interface, Basic HTML mode always played nice with screen readers and other accessibility tools.
Gmail’s Basic View Is Going Away
The Basic HTML view was intended for legacy browsers and slow internet connections.