The width property specifies the content width of boxes generated by block-level and replaced elements.


width: <length> | <percentage> | auto | inherit
Initial: auto
Applies To: all elements but non-replaced inline elements, table rows, and row groups
Inherited: no
Percentages: refer to width of containing block
Media: visual


width: value
Value Description
auto Depends on the values of other properties
length Width measurement: em | ex | px | in | cm | mm | pt | pc
percentage Width percentage calculated with respect to the width of the containing block


[window.]document.getElementById("element-id").style.width = "width";

Example | auto

Example | length

Example | percentage

Example | DOM


W3C Cascading Style Sheets, level 1

W3C Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification