Does WYSIWYG prevent HTML?

[Dean Landsman]

Again a question regarding how and why WYSIWYG seems to subvert the most basic of html tags (that used to work fine before I went to FireFox and switched to WYSIWYG):

Why does the tag <hr> not show as a hard ruled line, but instead shows as the written (typed?) syntax entered into the Manila Composer window?

To see what I mean, look at http://deanland.buzzword.com/2005/01/11  Look just above the bold, red-font typed line that says, "I should have known better."  You'll see the <hr> just hanging there, instead of it causing the desired html result.

Thanks in advance.

--Dean