If any target attribute refers to an unknown frame F, the user agent should create a new window and frame, assign the name F to the frame, and load the resource designated by the element in the new frame.

http://www.w3.org/TR/html4/present/frames.html#adef-target

【 在 hgoldfish (老鱼) 的大作中提到: 】
: 我好像在哪里看过这个不是标准行为。
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