w3 schools document.getelementbyid code example

Example 1: change innerhtml

document.getElementById("p1").innerHTML = "New text!";

Example 2: change html element

element.innerHTML =  "<p>read this</p>"	Change the inner HTML of an element
element.style.color = "blue";			Change the style of an HTML element
element.setAttribute(important, "true")	Change the attribute value of an HTML element
element.important = "true"				Change the attribute value of an HTML element