https://w3c.github.io/csswg-drafts/css-values/#trig-infinities has:
In tan(A), if A is one of the asymptote values (such as 90deg, 270deg, etc), the result must be +∞ for 90deg and all values a multiple of 360deg from that (such as -270deg or 450deg), and −∞ for -90deg and all values a multiple of 360deg from that (such as -450deg or 270deg).
Note: This is only relevant for units that can exactly represent the asymptotic values, such as deg or grad. rad cannot, and so whether the result is a very large negative or positive value can depend on rounding and precise details of how numbers are internally stored. It’s recommended you don’t depend on this behavior if using such units.
Given:
I'd prefer to remove the special-case for degrees here. Wdyt @tabatkins?
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