Message in Chinese (Simplified) (中文(简体))![](/img/flags/zh-chs.png)
名称为“<var>X</var>”的行为已存在,或者它是目标元素上现有属性的名称。
Unlocalized message![](/img/flags/en.png)
A behavior with name '<var>X</var>' already exists or it is the name of an existing property on the target element.
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