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showdownjs / showdown

A bidirectional Markdown to HTML to Markdown converter written in Javascript

Home Page:http://www.showdownjs.com/

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Nonstandard HTML comment endings

hohMiyazawa opened this issue · comments

commented

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 -->:

showdown/dist/showdown.js

Line 3566 in 9525598

}, '^ {0,3}<!--', '-->', 'gm');

This potentially causes a mismatch between visible and invisible page content.