In addition to the format displayed when accessing from a general browser, Gmail has a display format called ' Basic HTML view' that is used in browsers that are not supported by Gmail.

Google has quietly announced that it will pull the plug on the basic HTML version of Gmail starting in 2024. We’re writing to let you know that the Gmail Basic HTML view for desktop web and ...

If you prefer viewing your Gmail account in basic HTML, you'll soon be out of luck. Google is removing Gmail's Basic HTML view and replacing it with the Standard view across the board in January 2024.

Most will have been defaulted to the “new” Gmail view long ago, so unless you have been specifically requesting the “basic HTML” view, nothing should change for you. Another day ...