word-spacing: normal | <length> | inherit

• Defines additional spacing between words (normal same as 0)
• Negative values are allowed

p  { word-spacing: 0.4em }
h1 { word-spacing: -0.2em }
h1 { word-spacing: -1em }
h2 { word-spacing: normal }

Word spacing is 0.8em
Word spacing is -0.2em
Word spacing is -1em
Word spacing is normal

• normal is left to the browser to define
• Opera, IE8 refuses to overlap words while Firefox, Chrome and Safari allow it. It is a browser option.
• Child element inherits the parent's value

2em between words even for small font children