var width;

function getWidth()
{
 if (window.innerWidth) return window.innerWidth;
 else if (document.body && document.body.clientWidth) return document.body.clientWidth;
 else return 0;
}

function refresh()
{
/*Zähler*/
var i;
for (i=0;i<=8;i++)

 if (width != getWidth())
 {
  document.getElementsByTagName("h1")[0].style.fontSize =
  getWidth() / 4 +"%";
  document.getElementsByTagName("h3")[0].style.fontSize =
  getWidth() / 7 +"%";
  document.getElementsByTagName("p")[i].style.fontSize =
  getWidth() / 9 +"%";
  document.getElementsByTagName("li")[0].style.fontSize =
  getWidth() / 9 +"%";
  document.getElementsByTagName("li")[1].style.fontSize =
  getWidth() / 9 +"%";
  document.getElementsByTagName("li")[2].style.fontSize =
  getWidth() / 9 +"%";
  }
}

window.onresize = refresh;