Answers for "js set html attribute"

set attribute javascript

Element.setAttribute(name, value);

setAttribute()

element.setAttribute(name, value);
element.setAttribute("style", "background-color: red;");

set attribute in javascript

//Fetch id from html
var a = document.getElementById("id");

//variable.setAttribute("Attributes","Properties:Values")
a.setAttribute("style", "visibility:hidden;");

set property dom javascrpt

document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");

put new attribute on html tag using javascript

// Here's what you do for the style attribute
span.setAttribute("style", "width:110%;float:center;left-margin:-10px;top-margin:-10;");