LOL I downloaded the page, checked it in EditPlus and man, it's pretty funny 🙂
This page contains all kinds of code which try to crash the browser or system (in case of IE) by making use of known flaws in the software. Someone using Mozilla, Opera, Lynx, Netscape 6.x, Konqueror and any other browser than IE x.x and Netscape <6.x will most likely not notice anything.
I'm not certain about this piece of code, though:
Trying Self Referenced Frames Crash (various o/s)...
<FRAMESET ROWS = 50%,50%>
<FRAME SRC = "crash.shtml">
<FRAME SRC = "crash.shtml">
</FRAMESET>
Anyone knows why this might crash a browser/OS?