When I started my project, the default doctype in visual studio 2010 was set to:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
I missed setting it to a more recent version at the time.
Question 1: Would it be sufficient if I change xhtml1-transitional.dtd
for example in the line above?
Question 2: What version of html is required in order the iPad users can view the site?