"it has to take into account the major design elements on a web page and make intelligent choices based on the user's tap target" That's fine, so patent the _s

"it has to take into account the major design elements on a web page and make intelligent choices based on the user's tap target" That's fine, so patent the _specific algorithm_ used to make that decision. Implementations are fine to patent, IMHO. Broad concepts, such as "it should zoom in when I tap twice" are not.