[Commentor] LC-327 Ian Jacobs [Comment] * Why do you use "Always" here and not in other points? I recommend deleting "Always" for the same reason I suggest deleting "when possible". * What about markup languages that don't support this? [Working Group decision] We have removed the word "always" and have instead clarified in the explanatory text that this is an exception to the best practices on relative measures. All the markup languages in scope for this document (XHTML Basic and above) have support for this feature. [Commentor reply] 
yes
n o r e p l y f r o m c o m m e n t e r
y e s