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正确
<style>
@(13) {
background-color: red;
}
</style>
<body>
<h1 class="master">This is a header.</h1>
<p class="master">This is a paragraph.</p>
<p>This is a paragraph.</p>
</body>
<style>
.master:hover {
background-color: red;
}
</style>
<body>
<h1 class="master">This is a header.</h1>
<p class="master">This is a paragraph.</p>
<p>This is a paragraph.</p>
</body>
不正确
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下一题 ❯<style>w3exercise_input_no_0{ background-color: red; } </style> <body> <h1 class="master">This is a header.</h1> <p class="master">This is a paragraph.</p> <p>This is a paragraph.</p> </body> |