Detailed explanation of the css3 transition animation of menu bar 'three' transforming into 'X'

I recently wanted to imitate a page. One of the effects is that the three menu bars are transformed into X.

The effect is as follows:

Picture (1) Initial effect

Picture (2) Mouse hover effect

Idea:

The implementation of three horizontal lines: Traditionally, it can be achieved with three span tags, but there is a more clever method. One tag can achieve the three horizontal effect. According to Master Zhang Xinxu shared the idea of ​​using padding to achieve the effect of three with one label. The general principle is to use border-top, background and border-bottom for the upper, middle and lower horizontal lines respectively. Use background-clip: content-box to cut, and finally use padding to spread it up and down to achieve the visual effect of three horizontal lines, the realization of

X: and the deformed X There is no need for additional labels, and it is implemented using its own after before pseudo-class transform rotation and offset. It takes patience to adjust the angle.

It should be noted that using padding to achieve the three-horizontal effect, the trigger is not very sensitive. It is best to wrap the icon label with a label, and do: hover trigger on the wrapping layer

The following is the code

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