Capacitive touch screens know when your finger is getting close to the screen. Apple doesn't, afaik, open up that level of detail in its APIs, but it could be u

Capacitive touch screens know when your finger is getting close to the screen. Apple doesn't, afaik, open up that level of detail in its APIs, but it could be used by the system to delay the display of a 3rd party overlay when the user's finger proximity indicates a tap is imminent. This same approach could be used to pause movement on a web page during mid-render, for example if an ad or other content is late to load but the user is already clicking on a link. How many times do we end up clicking on something unintended because the page re-renders mid-tap/click? Starting with the Samsung Galaxy S4 or S5 the phone had the ability to use finger proximity as a highlighter of sorts. I loved it, but never saw the functionality really used for more than visual candy effects.