I am neurotic about saving all of my old devices and making sure that apps I write work on each of them. 

When I code interfaces, I determine the size of literally every element based off of the device screen height and width. That ensures my interfaces scale to fit phones and tablets, on any operating system. I can't remember the last time I hard-coded a pixel value. I'll do another post at some point detailing my passion for never hard coding pixel values - it will be a long one. 

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