Here's one of my older designs, 100% pure css of course.
http://pulsedesign.biz/printer/css.html 100% pure CSS using xhtml strict code. CSS has positive and relative positions, also has some floats. Should be a more "advanced example" for you.
w3c valid code;
http://validator.w3.org/check?uri=ht...r%2 Fcss.html
w3c valid (no warnings) css;
http://jigsaw.w3.org/css-validator/v...er/printer.css
Now we'll take the same page, and change nothing but the doc type. Changing it from xhtml 1.0 strict, to html 4.01 strict.
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http://pulsedesign.biz/printer/css-doctype.html
Page is displayed EXACTLY the same. I tested in FF 2.0x and Safari on OSX, and IE 6.0x on Windows XP.
I could pull out hundreds more designs and show you the same thing over and over. Instead, I showed an example on my end. Let's see one on your end.