I give more details
item : text field
in the description field "HTML Form Element Attributes" is
Fixed size can be set in "Width"
I need to generate dynamic size on the basis of data hidden field or database
This is NOT a recommended solution, since you are modifying data in the APEX metadata and could invalidate your APEX instance...
Just a warning...
Los Alamos, NM
I'm looking another solution
The new solution in CSS
I put the "Region Source"
width: &P6_WIDTH.; - dynamic size from hidden item P6_WIDTH