[1] [CITE@en-US[calc() - CSS | MDN]]
( ([TIME[2017-05-08 08:52:43 +09:00]]))
<https://developer.mozilla.org/en/docs/Web/CSS/calc>

[2] [CITE@en['''['''css3-values''']''' dropping min()/max() on calc()]]
( ([[L. David Baron]]著, [TIME[2010-09-09 05:39:05 +09:00]]))
<https://lists.w3.org/Archives/Public/www-style/2010Sep/0233.html>

[3] [CITE@en['''['''css-values''']''' Allow division of same types in calc() · Issue #545 · w3c/csswg-drafts]]
([TIME[2018-06-15 12:24:28 +09:00]])
<https://github.com/w3c/csswg-drafts/issues/545>