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Most people do not understand the knowledge points of this article "what is the use of html css using em", so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this article, "what is the use of em in html css?"

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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