Current Firefox and Chromium accept --!> as endings for HTML comments.
This is nonstandard, as HTML comments should end with -->. The standard does however disallow --!> inside comment strings, and as such, browsers are lenient and accept it as a comment ending anyway.
HTML comments are detected with a regex here, only matching -->:
Current Firefox and Chromium accept
--!>as endings for HTML comments.This is nonstandard, as HTML comments should end with
-->. The standard does however disallow--!>inside comment strings, and as such, browsers are lenient and accept it as a comment ending anyway.HTML comments are detected with a regex here, only matching
-->:https://github.com/showdownjs/showdown/blob/95255984ad80acf745ed74605bd3ad8357dc9b33/dist/showdown.js#L3566
This potentially causes a mismatch between visible and invisible page content.