What does & mean in css

Let’s first look at a piece of css source code:

ul{ margin-bottom: 20px; & >li { margin-bottom: 0; } }

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& represents the previous level of nesting.

This is the syntax of sass, which represents the upper-level selector.

The above source code is equivalent to the following code:

ul{margin-bottom: 20px;} ul > li {margin-bottom: 0;}

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