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Thoroughly understand the difference between unit px and Em,rem in CSS

Source: Internet
Author: User
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Px:
PX is actually a pixel, which is more stable and precise when setting the font size with PX. However, there is a problem with this approach, when users browse our web pages in a browser, and if they change the zoom of the browser, then the layout of our web page is broken. This is a big problem for users who are concerned about the usability of their website. Therefore, it is proposed to use "em" to define the font of the Web page.

Em:
EM is the size of the font that is scaled based on the datum. The EM essence is a relative value, not a specific number. This technique requires a reference point, which is generally based on the "font-size" of <body>. such as the official WordPress theme Twenntytwelve benchmark is 14px=1em.
In addition, EM is calculated relative to the attributes of the parent element, if you want to calculate the conversion between PX and EM, this site is good, the input data can be PX and EM mutual calculation. Hit here: px and EM conversions

Rem:
EM is relative to its parent element to set the font size, so there is a problem, any element setting, it may be necessary to know the size of his parent element. While REM is relative to the root element

Thoroughly understand the difference between unit px and Em,rem in CSS

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