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This article mainly introduces the meaning of text-indent:2em in css code, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

What is the meaning of text-indent:2em in css code?

Standard answer: the first line of a paragraph is indented in 2em (em is a unit of relative length).

What is em here?

Here em is a unit, such as px (pixels) abnormal HTML length unit, em is called relative to the length unit.

Conversion between em and px

1em is 16px.

Here 2em=32px, phase is to set CSS indentation 32px.

Understand the conversion instructions between html length unit EM and PX:

Em refers to the high font, the default font of any dabbling device is high, but 16px. Unmediated readers all match: 1em=16px.

Pixels and centimeters can not be directly converted, only need to explain the resolution (dpi) trick conversion

Often use 72dpi (computer display device) and 300dpi (photo)

72dpi 1cm = 28.346px 1em=16px=0.564cm=0.00564m

300dpi 1cm = 118.11px 1em=16px=0.135cm=0.00135m

Usually, these two units are not converted to each other, even if they are converted under the condition of a number of distinguishing rates.

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