As noted by Cameron in https://github.com/servo/servo/pull/16144, stylo supports calc() everywhere the spec says so, including all <angle> units, <integer>, <number>, ... There are a bunch of them that aren't supported in Gecko right now. We should evaluate this, and decide whether we want to ship it or disable parsing calc() in a bunch of those.
I don't think this really matter as far as there is no evidence that this breaks anything. Moving this to blocking bug 1365771 instead.
There are a bunch of DevAdvocacy issues around calc() compat in bug 1376206, would be fantastic if they're fixed in 57 via Stylo!
Documented: https://developer.mozilla.org/en-US/docs/Web/CSS/calc#Quantum_CSS_notes https://developer.mozilla.org/en-US/Firefox/Releases/57#Quantum_CSS_notes
status-firefox57=wontfix unless someone thinks this bug should block 57
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