让网页有淡入淡出的效果

以下两种可以随便用哪一种：

<meta http-equiv="Page-Enter" content="blendTrans(Duration=1)">
<meta http-equiv="Page-Exit" content="blendTrans(Duration=1)">

<meta http-equiv="Page-Enter" content="revealTrans(duration=5.0, transition=20)">
<meta http-equiv="Page-Exit" content="revealTrans(duration=5.0, transition=20)">

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