Out of the box, Safari displays your existing websites beautifully on the edge-to-edge display of the new iPhone X. Content is automatically inset within the display’s safe area so it is not obscured by the rounded corners, or the device’s sensor housing. Default behavior is for you to do nothing to your code and Safari on the X will automatically pad around the inset and rounded corners. This is just if you _want_ t…
Too bad more people aren't reading this before whingeing in the comments.
I think a more sensible default would have been to fill the irregular space with black to create a letterboxed appearance. Basically reduce the irregular space to inactive unless specifically requested by the site's designer.