Which of the following will use a Cascading Style Sheet to add a font character, font size, and background image to a Web page?
以下哪项会使用级联样式表，添加一个字体性质、字体大小，和背景图片，一个网页?。
A font is a collection of character images, called glyphs, and the mappings from character codes to the glyphs.
字体是称为图符的字符图像以及从字符码到图符的映射的集合。
Most systems fall back to displaying a placeholder of some sort when an appropriate character can't be found in the current font.
当前字体中找不到某个适当的字符时，多数系统会显示一个某种占位符。
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