The iPhone does clever automatic things to amp up the text for easier
reading. The algorithm is based on the width of the containing
elements in proportion to the overall page dimensions, but it’s not
something you can design away without making all of your pages rigidly
alike when it comes to text container dimensions.
There is a special CSS tag you can use to override this. If you wanted
to force all of the text on your page to remain in proportion to the
page design (so it’s exactly WYSIWYG with Freeway), then you would
need to add the following to your page in the Before /HEAD section of
Page / HTML Markup: