# fix(*): fixes malformed HTML coming from xsweet

This is to deal with what's described in the comments of #1023 (closed). Sometimes XSweet is turning math, which should look something like this:

`<p><math-display>...math...</math-display></p>`

to this:

`<h4><h4><math-display>...math...</math-display></h4></h4>`

If that's not invalid HTML, it's not quite sensical, and it breaks further parsing – so the math tags get thrown away. What this fix does is to replace `<h4><h4>`

and `</h4></h4>`

with `<p>`

and `</p>`

respectively; with this in place, parsing works normally.

*However!* This is basically plastering over a problem that's coming from XSweet. I don't know why we're getting the nested `<h4>`

s; I don't know if they're always `<h4>`

s. If there's a way to fix this problem on that end, that would be a greatly superior solution.