Css Em

px pixel (pixel) relative length units are relative to the screen resolution of the display (from the CSS Tutorial 2.0 manual). 　　The EM relative length unit is relative to the font size of the text within the current object, such as the font size of the current text in the row is not set artificially, relative to the browser's default font size (quoted in the css2.0 manual). The default font height for any browser is 16px. All unadjusted browsers are compliant: 1EM=16PX. So 12px=0.75em, 10px=0.625em. ...

Just learn Web page production, the teacher once told me to use CSS to enforce the definition of font size, or to ensure that everyone see consistent effect. This is particularly evident in the current Chinese site. including NetEase, Sohu, including most of these portal sites, with the absolute unit px (pixel). However, if you consider the usability of the site, the font size should be variable, some people who do not have good eyesight need to enlarge the font to see the content of the page. However, ie, which occupies most of the browser market, cannot adjust the size of the font that uses PX as the unit. Foreign people are very ...

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Font Size The CSS2 specification defines a font based on length-horizontal and vertical dimensions. This length is a numeric value and may be preceded with an optional plus (+) or minus (-) marker. 　　In addition, the value may have an optional unit identifier. In addition, the CSS2 specification defines two unit types: absolute units and relative units. The absolute value specifies the unit, and the relative unit specifies a value that is proportional to another value. The following list lists the relative unit identifiers: em: The height of the element font. It is calculated with the font size property of the element that uses the font ...

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Empty two words before the paragraph, do not use space. 　　You should use the first line indent text-indent. Text-indent can make the first line in the container indent a certain unit. 　　For example, Chinese paragraphs usually empty two characters before each paragraph. Here we need to know a length unit em. EM is the relative length unit. 　　The font size relative to the text within the current object. We usually empty two Chinese characters before each paragraph. 　　In fact, the first line is indented 2em. Look at the following example: <! DOCTYPE htm ...

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