javascript - How to determine the dimensions of textareas with scrollbars in Chrome -

javascript - How to determine the dimensions of textareas with scrollbars in Chrome -

i want determine width of textarea according content-box model. since offsetwidth property larger due padding , borders, utilize getcomputedstyle(), works fine in firefox 33 , opera 12.

for testing, i've set width: 400px; textarea, vertical scrollbar appears, chrome 38 gives me width of 383px in respond getcomputedstyle(). width of content-box without scrollbar, not defined width.

that not limited textareas, applies every scrollable element.

two questions:

is right behaviour or bug? how can determine right width of content-box?

javascript html google-chrome