代码编辑器：
x
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<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 4
<style>5
img {6
filter: opacity(30%); /* Chrome, Safari, Opera */7
filter: opacity(30%);8
}9
</style>10
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<p>转化图像的透明程度:</p>13
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<img src="/static/i/css/pineapple.jpg" alt="Pineapple" width="300" height="300">15
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<p><strong>注意：</strong> Internet Explorer 不支持 filter 属性。</p>17
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