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I know many #blind people who use GMail's HTML view. Not only will they be confused but will be unhappy.
"You can display Gmail on your browser in Basic HTML view until January 2024. After this date, Gmail will automatically switch to Standard view".
https://support.google.com/mail/answer/15049?hl=en
Bookmark this URL to go to basic HTML view.
https://mail.google.com/mail/u/0/h/
It should still work but doing so will not provide the option to set the mode as the default anymore.