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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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