What is the use of html css using em

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The nature of em:

1. The value of em is actually not fixed.

2. Em inherits the font size of the parent element and changes it absolutely according to the font size of the parent element.

Html css uses em to cripple the HTML source code for the unit instance:

Percentage of css em unit usage body {background:#333; font-size: 62.5%; margin: 0px; padding: 0px;} / * set the background, ink, edge, etc. * / div {background:#fff; width:450px; height:180px; margin:0 auto;padding:10px; border:4px # 000 solid; font-size:1.2em;} of the page

Body setting equipment font-size: 62.5%; setting equipment equipment font-size:1.2em for div, which is equal to my font size equal to 12px.

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