Answers for "create a new class in a tag by dom"

create element javascript with class

// create div element by javascript with class

var div = document.createElement('div');
div.className = "div1";

javascript create element with class

Let suppose we are creating a div using javascript create element
// create a new div element 
	var newDiv = document.createElement("div"); 
// assigning class name to the new div
	newDiv.className = "className";