Liquid textfield width

Question

I have this fairly simple form:

Answer 1

Yeah length is for character count, not width.

You want the text box to fill all available space short of what the button takes up? This is doable with a table (but I consistently get booed on Stack Overflow for suggesting tables). Let's say for the sake of argument you use DIVs with display:table, but just for simplicity I'll illustrate with actual table markup.

The width 0 on the button cell might seem odd, but table cells take their widths only as suggestions. It'll stretch to fit the content no matter how skinny you make it.