Javascript for adding a custom attribute to some elements

Question

Given a section of HTML, can I selectively pick some types of elements (e.g., input) and add a custom attribute using JavaScript? I would also need to remove this attribute if i

Answer 1

Hello!

Adding attribute via javascript:

var myDiv= document.getElementsByClassName("first-div")[0];
var myp= myDiv.children[0];
nyp.setAttribute('myAttribute','valueForAttribute');

getting the attribute via javascript:

   console.log(myp.getAttribute('myAttribute'));