实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<body>
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​
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<center><h1>This is a heading</h1></center>
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<p>The heading above is aligned to the center of this page.</p>
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​
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</body>
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</html>