If you click to use LaTeX, the "math editor" option, you cannot cancel or escape out of input. VisualEditor adds the <math></math> tags regardless and this can only be removed by saving and going to source.

Ideally, a cancel [X] or keyboard options should work to remove this.

https://www.mediawiki.org/w/index.php?title=User:Keegan_(WMF)/sandbox&action=history

Version: unspecified
Severity: normal