<acronym> 标记 定义 an acronym. <applet> 标记 定义 an embedded applet. <basefont> tag specifies a default font-color, font-size, or font-family for all the text in a document. <big> tag is used to format the text one size bigger, and can be in relation to your <font> or <basefont> size, if you’ve specified either one. <center> tag is used to center text. <dir> tag is used to list directory titles. <font> tag specifies the font face, font size, and font color of text. <frame> 标记 定义 one particular window (frame) within a frameset. <frameset> 标记 定义 a frameset. The frameset element holds two or more frame elements. Each frame element holds a separate document. <s> and <strike> tags define strikethrough text. <tt> tag is used for “typetype” text, or fixed-width typewriter-type font. Other than the different type style, it has normal font characteristics <u> tag is used to underline text. 这些标记基本上都没有什么用处了(也许你会觉得有几个标记和HTML5里的新标记有些相似)。其中一些我们在早期的旧版的浏览器里使用过,但如今已经失去其作用,而另一些标记的功能已经被CSS功能所取代了(例如设置字体和文本样式的标记)。