Use inputSize attribute for that
Seems like an undocumented feature (good guess of me on the name :))
Version used: 3.1.3
Please insert this attribute into the tag library descriptor file (.TLD) and update the online documentation accordingly, since I'm sure the majority of users wont find it because a typical IDE like Eclipse does auto completion on tags depending on a TLD.
this already resolved :) Just before your post. Will be merged to 3.1.4. Thanks!