Live
<body> <span>中国</span> <span>美国</span> <!--宽度本身就是内容的本身--> <span>中国1111111111111</span> <span>美国222222222222222</span> <span>美国2222222<em>123123123</em>22222222</span></body>
Live
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span { /* 行内元素设置宽高无效*/ width: 100px; height: 100px; background-color: red;}
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