The difference between two class selectors in css is whether there are spaces or not:
##
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
.p1.p2{width: 100px;height: 100px;background: red;}/*多类选择器*/
.p1 .p2{width: 100px;height: 100px;background: yellow;}/*后代选择器*/
</style>
</head>
<body>
<p class="p1 p2"></p>
<p class="p1">
<p class="p2"></p>
</p>
</body>
</html>
Conclusion: There is no space between two class selectors in cssForm Multi-class selector , has spaces to form a descendant selector .
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