Incorrect markup in "Answer" button for comments

[vellip]

URL: Everywhere, where there are comments
user: N/A
expected behaviour: It should either be a link or a button, not both.
behaviour: It's a link in a button.
important screensize: N/A
device & browser: N/A
Comment/Question: Should be easy to fix, might introduce breaking changes though, if any project relies on that markup for styling.