[css-values-3] Form control restrictions to line-height don't affect lh/rlh #3257

Author: fantasai

css-values-4/Overview.bs

@@ -1909,6 +1909,10 @@ Font-relative Lengths: the ''em'', ''rem'', ''ex'', ''rex'', ''cap'', ''rcap'',
 	too many pages expect these units to be exact multiples of the specified 'font-size',
 	rather than the <em>actual</em> font-size after applying user preferences.
 
+	Some user-agents apply restrictions to the 'line-height' values on form controls.
+	These must have no effect on the ''lh'' and ''rlh'' units.
+	The effect on their descendants, however, is undefined.
+
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