[css-color-5] Clarify calc(none) = calc(0), w3c#7771

svgeesus · svgeesus · commit d629921597dd · 2023-02-01T14:39:01.000-05:00
diff --git a/css-color-5/Overview.bs b/css-color-5/Overview.bs
@@ -998,6 +998,8 @@ which are then carried forward as missing.
 	</figure>
 </div>
 
+However, if calculations are done on missing values, ''none'' is treated as 0.
+
 <h3 id="relative-RGB">Relative sRGB Colors</h3>
 
 The grammar of the ''rgb()'' function is extended as follows:
