I have a website using a huge background image (2000x1500) in a div container (100% x 100%).
When I open that site on Safari on an iPad it gets scaled down (~40%) in a d
Adding this worked for me when I had a background image on the background canvas...
body{ -webkit-background-size: 2000px 1400px;}
Obviously one has to replace the dimensions with the correct size for the image.