property real scale: experimental.test.contentsScale * experimental.test.devicePixelRatio
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// iOS 5.0’s iPhone user agent
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experimental.userAgent: "Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3"