A different tact (for some cases) to the same end: use elinks[0] and in an active <textarea>, press shift-ctrl-T to pop up your favourite editor[1]. This works for gmail, for example.
I can't recommend that. Elinks doesn't verify SSL certs when connecting to HTTPS sites. It hasn't had a release in five years. It also has worse support for web standards than IE6.
Lynx doesn't have as good standard support, but it is still semi-active (2017-07-10 (2.8.9dev.16)) over at InvisibleIsland[0], and can be compiled with OpenSSL support. (Windows installers require OpenSSL by default).
[0] https://en.wikipedia.org/wiki/ELinks
[1] https://en.wikipedia.org/wiki/Nvi