代码：

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style> #i1{ background-color: blue; } .c1{ background-color: beige; } span{ background-color: aqua; } div span{ background-color: red; } #c2,.c3,p{ background-color: black; color: white; } input[type="test"]{ width: 100px; height: 200px; } </style></head><body> <div id="i1">id选择器属性</div> <div class="c1">class选择器属性</div> <span>标签选择器属性</span> <div><span>层级选择器</span></div> <div id="c2">组合选择器的c2</div> <p>组合选择器的p</p> <div class="c3">组合选择器的.c3</div> <input type="test"></body></html>

展示