I tried to set up a simple test case, but was unable to.

The page has a table. I use outerWidth(true) to find the widths of the table cells. As it traverses the row, Safari adds a blank cell before each table cell effectively doubling the number of cells.

$('tbody',$table).children('tr:first').children('td').each(function(idx) {

            // Get the width of this cell and add a padding.
            var cell_width = $(this).outerWidth(true) + sr_mob_table_cell_pad;

});

This is only in Safari. Not Chrome. Haven't checked IE.

When checking the dom the only difference I see is that the outerWidth(false) leaves the style attribute undefined, while outerWidth(true) adds an empty style attribute.