What are the quickest and easiest ways to ensure existing web pages display well on mobile platforms?

Question

The pages in question contain a lot of javascript and CSS. How well are these supported by mobile platforms generally?

Is there a browser emulator (or equivalent tool) to assist testing?

Answer 1

Opera has an option to view pages as through a mobile device. I've found it useful in the past.

Answer 2

I can tell you that Apple's Mobile Safari on the iPhone renders Stack Overflow perfectly, which I find rather amazing.

This is a site for programmers, not average users, so we accepted a lot of JavaScript dependencies.

I do wish more mobile devices had browsers as powerful as Mobile Safari. I hear good things about Opera Mini as well.