§4.1 字体大小
html有七种字号，1号最小，7号最大。缺省字号为3，可以用<basefontsize=字号>设置缺省字号。
设置文本的字号有两种办法，一种是设置绝对字号，<font size=字号>；另一种是设置文本的相对字号；<font size=±n>。用第二种方法时“＋”号表示字体变大，“－”号表示字体变小。
<font size=7>Today is fine!</font>Today is fine!
<font size=6>Today is fine!</font>Today is fine!
<font size=5>Today is fine!</font>Today is fine!
<font size=4>Today is fine!</font>Today is fine!
<font size=3>Today is fine!</font>Today is fine!
<font size=2>Today is fine!</font>Today is fine!
<font size=1>Today is fine!</font>Today is fine!
§4.1.2 字体风格
字体风格分为物理风格和逻辑风格。物理风格直接指定字体，物理风格的字体有<b>黑体，<i>斜体，<u>下划线，
<tt>打字机体。逻辑风格指定文本的作用。
<em>强调 <srrony>特别强调 <code>源代码
<samp>例子 <kbd>键盘输入 <var>变量
<dfn>定义 <cite>引用 <small>较小
<big>较大 <sup>上标 <sup>下标
物理风格
<b>Today is fine!</b>Today is fine!
<i>Today is fine!</i>Today is fine!
<u>Today is fine!</u>Today is fine!
<tt>Today is fine!</tt>Today is fine!
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