W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<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>