monospaced font 等宽字体
It sets the font to a 24-point bold monospaced font by default, and a 48-point italic serif font when the mouse moves over the button.
它把字体默认值设为24点黑体monospaced的字体，当鼠标移到按钮时，把字体设置为48点斜体serif字体。
By convention, you also display the contents of a element in a monospaced font.
依照约定，还要用等宽字体显示元素的内容。
Keyboard input, indicated with the HTML element, is typically represented in a slightly larger monospaced font. Here's an HTML sample.
通常以稍大的等宽字体来表示键盘输入(在HTML中，用元素表示键盘输入)。
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