CSS 2.1 Reference: width Property

The width property is used to specify the width of the content area of an element's box. (See CSS Box Model for information concerning the boxes that are generated for elements.) The width property does NOT include the width of the padding, border, or margin areas.

This property is specified by using a length, percentage, or keyword, according to the syntax shown above. Negative values are not permitted. If a percentage value is used, the value will be a percentage of the containing block.

CSS Example: The width properties are set using length and percentage values.

  #tst1 {width: 200px;}
  #tst2 {width: 50%;}

• auto - The width is set automatically by the browser.
• inherit - The inherit keyword is used to specify that the value for this property should be taken from the parent element. If inherit is used with the root element, then the initial value for this property will be used.