一个JS小书签工具，可聚焦选中元素并隐藏页面其他内容，支持鼠标滚轮切换选择层级，适合搭配沉浸式翻译或作为专注模式使用。
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一个 JS 小书签，选中指定元素后隐藏页面内的其他元素，按 ESC 退出后恢复页面。选择元素时可以用鼠标滚轮切换选择层级。可以和“沉浸式翻译”搭配使用，或者作为一个简单的专注模式实现。Github 地址：https://github.com/jerrylususu/mainonly
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