Mobile Websites Can Tap Into Your Phone's Sensors Without Asking

When an app wants to access data from your smartphone's motion or light sensors, iOS and Android require them to get your permission first. That keeps a fitness app, say, from counting your steps without your knowledge. But a team of researchers has discovered that those rules don't apply to websites loaded in mobile browsers, which can often often access an array of device sensors without any notifications or permissions whatsoever.

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