[dpe82]

And there were a bunch of WYSIWYG editors in the mid-late 90s. It seems like everyone had one, including Netscape: https://en.wikipedia.org/wiki/Netscape_Composer

[JimDabell]

The very first web browser that ever existed – WorldWideWeb – had a WYSIWYG editor.

https://en.wikipedia.org/wiki/WorldWideWeb