resize textarea to fit in a fluid width layout with javascript -

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i have fluid layout , need textarea expand/reduce depending of size of parent container.

in css this:

textarea{ width: 100%; }

but doesn´t work textareas.

how can javascript? can parent element width , them calculate number of cols fit width how know size of 1 col (in px)?

chk out : http://css-tricks.com/box-sizing/

  textarea {             -webkit-box-sizing: border-box; /* safari/chrome, other webkit */             -moz-box-sizing: border-box;    /* firefox, other gecko */              box-sizing: border-box;         /* opera/ie 8+ */            }

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