for each element type in body

by 
var elements = document.getElementsByTagName('div');

for (var i = 0; i < elements.length; i++) {
    elements[i].innerHTML = "foo";
}​

Live DEMO

If you want to look only in the <body>:

var elements = document.body.getElementsByTagName('div');

for (var i = 0; i < elements.length; i++) {
    elements[i].innerHTML = "foo";
}​

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