Chrome Version       : trunk
OS Version: 
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari: FAIL
    Firefox: PASS (as in, the two tables render the same). I'm fixing behavior in https://bugzilla.mozilla.org/show_bug.cgi?id=957915 to agree with the spec and sanity.
    IE/Edge: Didn't test

What steps will reproduce the problem?
1. Open the attached test-case.

What is the expected result?
The two tables render the same.

What happens instead of that?
The two tables render differently.

See https://drafts.csswg.org/css-values/#calc-computed-value / https://github.com/w3c/csswg-drafts/issues/3482