I just found out how to modify DOM elements using:
element.setAttribute(name, value);
Adds a new attribute or changes the value of an existing attribute on the specified element.
- name is the name of the attribute as a string.
- value is the desired new value of the attribute.
Example:
var d = document.getElementById("d1");
d.setAttribute("align", "center");If the specified attribute already exists, then the value of that attribute is changed to the value passed to this function. If it does
not exist, then the attribute is created.