实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
​x
 
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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h1 {font-size:250%;}
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h2 {font-size:200%;}
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p {font-size:100%;}
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</style>
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</head>
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​
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<body>
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<h1>This is heading 1</h1>
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<h2>This is heading 2</h2>
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<p>This is a paragraph.</p>
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</body>
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​
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</html>
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