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去除头尾空格
From HTML5 Chinese Interest Group Wiki
定义
当用户代理要从一个字符串中去除头尾空格（strip leading and trailing whitespace）时，用户代理必须移除该字符串开头与结尾处的所有空格字符。
参考
- W3C《HTML5 草案》 2.5 Common microsyntaxes