Google updated a Gmail support article to say that the basic HTML view for Gmail will be discontinued in January 2024.

Google is sunsetting Gmail's basic HMTL view, which allows users to look at their emails in a bare-bones state, starting January 2024.

Google is notifying Gmail users that the webmail's Basic HTML view will be deprecated in January 2024, and users will require modern browsers to continue using the ...

This time the scythe is coming for one of the company’s oldest features—Gmail’s basic HTML view. In January 2024, that simple interface heads for the great beyond.