SVG doesn't work consistently. A site has https policy setup. If I open the page via https -- svg works. If I click link to same svg using http, it doesnt
Here is a demo link: https://www.doyourmath.com/t.html .
It works if you open the link. Inside it has link to same page but with http://. The https policy of the site forces FF to redirect http:// link to https://. After this -- SVG masks dont work, and nothing helps, even F5. Though the page and link is the same as first one.
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I mean if you click a link in https://www.doyourmath.com/t.html , SVG is not rendered correctly anymore (though the page is exactly the same as originally).
I suspect that somehow during redirect from http:// to https:// svg-rendering-engine gets messed up.
I see, the narrower block of red is correct, and wider block of red is incorrect.
If you right-click the link in the page and launch it in a new private window, Firefox doesn't "redirect" to HTTPS and it works fine. So the problem does seem to be tied to how Firefox implements Strict Transport Security.
I can't tell what's going wrong. I can't find any useful error messages, so better tools and/or deeper knowledge are needed. I suggest filing a bug on https://bugzilla.mozilla.org/
This issue has been fixed from Firefox 45 onwards by https://bugzilla.mozilla.org/show_bug.cgi?id=1247733