http://bonsai.mozilla.org/cvsview2.cgi?diff_mode=context&whitespace_mode=show&file=nsHTMLDivElement.cpp&branch=&root=/cvsroot&subdir=mozilla/content/html/content/src&command=DIFF_FRAMESET&rev1=1.51&rev2=1.52
Click on blame, then go back, clicking again on blame is weird.