When you touch multiple web elements simultaneously, perhaps due to the widgets being too small, and/or too close together, the area around where you touched pops out, giving you a magnified view of that area. I suppose this is so that you can clarify which interface control that you intended to touch.
Does anyone happen to know what this feature is called?
Eye tracking interfaces have a similar feature called “Gaze Clarification” for selecting small targets. As you look at your intended target, a portion of the screen that includes that target becomes magnified, and the zoom level keeps increasing and increasing as you home in on your desired spot.