On the twitter login page, the label for input fields arrive inside input fields that uses a common trick with javascript/jquery. However, I went through a twitter source to figure out how they are doing that. I found onChange: it adds a class 'hasome' to a parent div and has a default text as a span, which never gets a property like login page, the label for input
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Twitter如何在文本框中放置标签？
来源：互联网
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