even more kudos to those that are w3c xhtml 1.1 and CSS compliant
as evulish stated, the best pages are those that work cross-browser. therefore, try to use a minimum of javascript, except for the well-known functions (alerts & confirms are fine, et cetera), as different implementations of javascript can been the bane of compatibility. also, as far as resolutions go, again I recommend CSS. If you use relative font and content area sizes, CSS will help your site to automatically scale to whatever the viewing screen size. If you want more info on using CSS, you might try
www.htmlhelp.com (note, this site also has a comprehensive reference of HTML tags and attributes). Just remember that some of the "cool" stuff CSS can do (different color scrollbars, et cetera) is only implemented by some browsers, by which I mean IE.
However, using CSS it's possible to do some things with much less than it would otherwise take. Take rollover effects, for example. By using the CSS a:link and a:hover attributes, you can easily make a link change color, background, or style when the mouse is over it. You can also use CSS for TABLE-tag like layout, but without tables (which are notorious for problems when it comes to scalability).
finally,
server-side languages are the ultimate in cross-browser compatibility! - as long as the html the output works in all browsers, you don't need to worry about the functionality working
