I would like to make it so when user scrolls down and reaches a certain div, say #float, set that div to margin-top: 50px and position fixed, and if user scrolls back up undo those changes. It's hard to understand I know ))) If you I would like to make it so when user scrolls do
阅读背景：
如何将css添加到div中(当它到达页面顶部时)?
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