The length, width and height are the dimensions of a geometrical figure that depict how long, wide and high a figure is. Learn more about the length width height of figures, with examples. The width CSS property sets an element's width . By default, it sets the width of the content area, but if box-sizing is set to border-box, it sets the width of the border area. Learn the meaning of width as the distance across something from one side to the other, and see how to use it in sentences and phrases. Find out the pronunciation, synonyms and translations of width in different languages. Utilities for setting the width of an element.