案例：html/html5 案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<body>
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​
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<h3>不带有外边距的图像：</h3>
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<p>
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<img src="/img/w3xue_logo_white.jpg" align="middle" />
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This is some text. This is some text. This is some text.
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</p>
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​
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<h3>左右外边距各为 50 像素的图像：</h3>
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<p>
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<img src="/img/w3xue_logo_white.jpg" align="middle" style="margin:0px 50px" />
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This is some text. This is some text. This is some text.
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</p>
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​
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</body>
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</html>