I was wondering if anyone could recommend a simple to use debuging program for html.

Preferably with the following support (not nessisarily needed though):
CSS debuging, Ability to load one line of code at a time with a preview (not sure if that makes sense, i remember using a program called bluejay a while back for java that had this option... loads the program one line of code at a time, while you press next to go to the next line of code)


Thanks for any suggestions.

I'm not sure whether this is what you're after, but there are plenty of useful FireFox plugins that enable real-time editing of CSS/HTML so that you can see the impact you're having straight away.

I think the above functionality is all part of the "Web Developer Toolbar". There are also similar toolbars available for Opera and IE (intended for IE7 I think) - whilst these are worth having sometimes, they aren't as good IMO.

Another useful tool I find (again in FireFox) is the "View Formatted Source" extension, which shows you the CSS applied to HTML elements as you view the formatted source This is particularly helpful when you get confused by specificity and/or other priorities affecting which CSS rules are taking priority over others (it lists the CSS in the order applied, and also includes line numbers for you to refer to your stylesheet).

Finally, I edit/create my CSS stylesheets in TopStyle Lite which has a built-in preview (only sometimes useful) and I believe it uses IE's rendering engine for this.

As Damien noted, there are a couple of really good Firefox extensions, the Developer toolbar is one, and Firebug is the other. I use the 2 of them together and it's a huge help. Another huge help for debugging your code is HTML Tidy - which you can get as a stand-alone program AND as an extension for Firefox. TopStyle comes with HTML Tidy, I use the Pro version and it's really good at flagging syntax errors on the fly when coding CSS.

Amazing!

Firefox plugins will work wonders for me, never crossed my mind to look for plugins. I like to do most of my work in linux, so it works perfectly for me. Thanks so much for the replies!