If there is one battle that continues to rage, it's the war for browser supremacy.
While exact market share figures change on a daily basis (and vary widely from site to site), Microsoft's Internet Explorer commands about 65 percent of the market, Mozilla's Firefox about 20 percent, Apple's Safari about 8 percent, and Google's Chrome about 2 percent.
There are three main rendering engines:
Trident, from Internet Explorer, is used by many applications on the Microsoft Windows platform to render HTML, including the minibrowsers in Winamp and RealPlayer. Gecko, Mozilla's open-source rendering engine, is used by a variety of products derived from the Mozilla code base, including the Firefox Web browser. WebKit, originally from Konquerer, and currently best-known as powering Apple's Safari and Google's Chrome Web browsers.
Different engines mean that developers (and users) are still forced to contend with Web sites that are designed with one specific browser in mind. This often means a lack of functionality or a flat-out inability to use a site with the wrong browser.