I see the HTML source uses MathML:
Correct. The Javascript is because apparently browsers have to be forced to render the MathML; I don’t understand the details.
I couldn’t tell from the screenshot what browser and OS you’re using
Debian unstable’s Iceweasel.
I tried three browsers and in none of them did javascript make a difference. (I had both success and failure.)
(Just in case it wasn’t clear, I do have JavaScript enabled in Chrome.)
Correct. The Javascript is because apparently browsers have to be forced to render the MathML; I don’t understand the details.
Debian unstable’s Iceweasel.
I tried three browsers and in none of them did javascript make a difference. (I had both success and failure.)
(Just in case it wasn’t clear, I do have JavaScript enabled in Chrome.)