It’s about a month old, but here’s my Park&Co blog post on how websites do not have to look the same in every browser. If you’re interested in web development, give it a read.
Unlike other media, in web work we have no control over the end user’s environment, which ultimately determines how the website will render. We can’t control the font size you use. We can’t control your screen size. Most of all, we can’t control the browser you use, let alone which version of that browser.