iOS 8.3 - Meta viewport with fixed width results i

问题:

After upgrading my iOS devices to iOS 8.3 I noticed some weird behavior with the meta viewport. If I set the viewport with fixed width(a number such as 640, other than device-width) and rotate my device while I am on a webpage, the whole content will get smaller and eventually the browser will crash.

<meta name="viewport" content="width=640, initial-scale=1.0,user-scalable=no, target-densitydpi=device-dpi">

Is there a way to fix this issue?