2.1.3 [HTML] Section 6.6, Lengths


The specification states:

 MultiLength: The value ( %MultiLength; in the DTD) may be a %Length; or a relative 
 length. A relative length has the form "i*", where "i" is an integer. When 
 allotting space among elements competing for that space, user agents allot pixel 
 and percentage lengths first, then divide up remaining available space among 
 relative lengths. 

All Document Modes (All Versions)

Relative length values for attribute lengths of type MultiLength are not supported.