//getElementById().......is more useable
//getElementByClassName()....not work at IE 8
//getElementByTagName()....not work at IE 8


<<<<find object by id>>>>

//document.images
//document.forms
//document.title
 var mydiv = document.getElementById("show");
 mydiv.innerHtml = document.forms[0].value
 <<<<<<<querySelector>>>>>
 var mydiv = document.querySelector("img");
 mydiv.title = "mytitle"