css3类选择器之结合元素选择器和多类选择器用法:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.p2{font-size:30px;}
/*结合元素选择器*/
p.p1{color:rebeccapurple;}
/*多类选择器*/
.p1.p2{font-style: italic;}
</style>
</head>
<body>
<div class="p1">看我</div>
<p class="p1">我就是我</p>
<p class="p2">我是一段文字</p>
<p class="p1 p2">我还是斜体字</p>
</body>
</html>