pre-wrap equivalent

IE/win Expanding Box
Stopping long words destroying layout

Contrary to spec, IE allows very long words to expand a box widthwards - which can then easily destroy a layout if other boxes are floated right.
Add this rule to the box that holds blog comments (or do what I did, and just add it to the body tag):
body {word-wrap: break-word;}

white-space: pre-wrap; /* css-3 */
white-space: -moz-pre-wrap !important;  /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: break-word; /* Internet Explorer 5.5+ */

<nobr> equivalent

.nowrap { white-space: nowrap; }