一个HTML文件中包含了所有将显示在网页上的文字信息，其中也包括对浏览器的一些指示，如哪些文字应放置在何处，显示模式是什么样的等。如果你还有一些图片、动画、声音或是任何其它形式的资源，HTML文件也会告诉浏览器到哪里去查找这些资源，以及这些资源将放置在网页的什么位置。HTML文件通过标志符(tag)来实现这一功能。

-An HTML file that contains all the text displayed on the page of information, including some indication of the browser, such as which text should be placed where the display mode is kind of like. If you have some pictures, animations, sounds, or any other form of resources, HTML file will tell the browser where to find these resources, and the resources that will be placed in what position on the page. HTML document by identifier (tag) to achieve this functionality.