TAILIEUCHUNG - HTML cơ bản - p 4

14 Chapter 1: HTML and the Web Widgets come in many varieties and are rarely harmful. They run within the browser’s security setup and are generally isolated from your computer’s file system. However, they can cause trouble if they are not well written. The problems include messing up the display of a web page, using up too much of the browser resources, or even causing a browser to crash. Any stand-alone computer application or software program that exchanges information over the Web (Twitter clients, for example) is a user agent. So are the automatic software update programs that come with computer operating. | 14 Chapter i HTML and the Web Widgets come in many varieties and are rarely harmful. They run within the browser s security setup and are generally isolated from your computer s file system. However they can cause trouble if they are not well written. The problems include messing up the display of a web page using up too much of the browser resources or even causing a browser to crash. Any stand-alone computer application or software program that exchanges information over the Web Twitter clients for example is a user agent. So are the automatic software update programs that come with computer operating systems. So is the online Help feature of Microsoft Word or for that matter an Xbox Nintendo or PlayStation game console. Many of the apps on a modern smartphone are user agents sending requests to web servers and using the returned information to do something useful or keep you informed. Every web browser must provide three basic functions 1 It must provide a control interface for human users 2 it must exchange information with other computers and 3 it must interpret HTML and render a web page. We are primarily interested in this last function how HTML is understood by a browser and how that determines what is seen on the page. Many browser makers use the same open source HTML rendering engines and differ mostly in their user interfaces. As a result only four browser types cover most Web surfing Internet Explorer Mozilla Firefox Flock Webkit Safari Chrome and everything else mobile phone browsers legacy versions of IE and Internet appliances . As with browsers several different web servers are in use today hosting nearly a quarter billion websites in total. By far the most popular web server according to a November 2009 survey by Netcraft is Apache an open-source product from the Apache Foundation. It hosts about half of all sites worldwide. The next most popular web server is the Internet Information Server IIS from Microsoft with about one-third of the market. .

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