<html> <body> <b>This text is bold</b> <br /> <strong>This text is strong</strong> <br /> <big>This text is big</big> <br /> <em>This text is emphasized</em> <br /> <i>This text is italic</i> <br /> <small>This text is small</small> <br /> This text contains <sub>subscript</sub> <br /> This text contains <sup>superscript</sup> </body> </html>
This text is bold
This text is strong
This text is big
bold与strong都会使文字显示为相同的加粗状态，但strong会在语义上增加强调的意思。big仅仅增大字号。
This text is emphasized
This text is italic
This text is small
同上。
This text contains subscript 下标
This text contains superscript 上标
原文：http://www.cnblogs.com/breakdinner/p/4509695.html