Some things in their code I don't understand.  What's the relationship
between the ID and the class?

ID can only be applied to a single tag on a page. Class can be applied to any number of tags.

<div id="styleswitchheader" class="hidden">

How can a class attribute have more than one entry?
<body class="highc smallfont leftalign">

This is legal. It means that the body has three different classes. Rules for each class will apply

Can divs be used without a closing tag like this (or maybe I missed them).
<div id="container"><div id="leftedge"><div id="rightedge">

NO! It is sloppy code to not close (almost) ANY tag. <div> must have a matching </div>

If you are using xhtml then you can do this: <br /> for any tags that contain no text. In html, tags that contain no text are not closed.

Joel Goldstick
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