The WBR element is a stand-alone element which indicates to the browser
where a particular word is ALLOWED to be broken. This does not
necessarily mean that the word WILL be broken at this point - it is just a
guide for the browser. Within the context of the NOBR element, the WBR element
EXPLICITLY tells the browser where to put the word/line break.
This element does not accept any attributes
<nobr>This is a really
super-duper, extremely long run of no<wbr />break text
which should be broken only where we tell it to</nobr>
Note: Style Sheet attributes are not listed for
the WBR element because of a caveat listed in the Cascading Style Sheets
specification for the BR element - It states that the break element is a
'Replaced Element' that is replaced in the document with a line break and
thus has no properties. Although WBR is not in any standards yet that the
CSS1 authors would consider, WBR offers a similar effect to BR so it is
placed in the same class with respect to style sheet treatment.
Beginning with Netscape 6.x, the use of WBR as a line-breaking mechanism inside
the NOBR element is no longer supported. To read more about this decision see
Mozilla's Bugzilla 6347.