CSS2盒模型的3D示意图
1.TCP/IP is the universal connectivity protocol; everything from mainframes to laptops to cellular phones can connect to the Web using it.
2.HTML is the universal rendering language. Although not all browsers support all functions, there is a core set of HTML tags that can be rendered on any browser.
3.Finally, Java's promise of "write once, run anywhere" makes supporting the wide variety of devices on the Web much easier.
And XML may be change the web too.
在中间四层能够实现某种程度上统一的使用，但在用户层（IE,FF...）则有些困难.
被CSS在IE和FF中的不同解析绕的头大。问题仍为解决。
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