Web pages are using your phone's sensors to spy you.
"...a web page can only access these sensors if we are browsing through it , and not if it is in the background. However, through the changes in the luminosity sensor and the movement sensor, it is possible to deduce the PIN that the user may be entering on the screen. In addition, they can know what parts of the screen they are viewing through algorithms."
Linux Geeks doing what Linux Geeks do..