hreflang handler is an Chrome Extension to handle hreflang information.
When the site containstags, this Extension shows an icon in the omnibox. This icon has a popup menu for language selection.
See also following site on hreflang.
http://support.google.com/webmasters/bin/answer.py?answer=189077
谷歌浏览器、其他Chromium内核的浏览器
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