Exception when saving after renaming empty html to HTA #275
Description
I'm having trouble saving when the empty file is renamed to .hta. The cause is HTA defaults to IE6 compatibility if not forced by the X-UA-Compatible meta tag and the use of .classList.add( in Messages.js here:
is causing it to throw an exception (https://caniuse.com/classlist says that classList is only usable starting IE10).
It would help to either add the X-UA-Compatible meta tag or alternatively a) document what version of IE is supported and b) just display a message if it is too old.
(yes, I know it's barely documented that saving as HTA would work, it's only mentioned in this one tiddler):
https://github.com/TiddlyWiki/TiddlyWiki/blob/master/content/ServicePack2Problems.tid
I managed to work around this in my copy by manually adding the X-UA-Compatible meta tag.