A computer jargon
term used to describe all the character
s that don't display
any visible symbol
. Besides the space
character, whitespace also includes the tab
character, the return
character, the line break
character, and in some environments, the non-breaking space
character and other weird spaces.
In HTML, all sequences of whitespace characters in the codes are represented as a single space for presentation purposes, except in a <PRE> block.