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Adds a fixed header element for use by other scripts
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/18233/187970/Window%20floating%20container.js
Scripts that import this library need to declare the three permissions required by this library.