know it well...I hand code my pages even though dreamweaver can do it for me.. probably save me a shit load of time..
If you don't know it, it's hard to find out where you have an error on your pages or to make changes.
I had someone build my site when it first started. It was an incredible design.. but she used css which I had the hardest time trying to figure out where to do things when I updated... I just rebuilt the site myself so I know what the fuck is going on..not as pretty..but I can maintain it myself.
