how to add and remove css class

Question

how to remove CSS default class

This is my div

This is my css class

#messageContai         


        

Answer 1

For IE10 and up use these methods:

// adds class "foo" to el
el.classList.add("foo");

// removes class "foo" from el
el.classList.remove("foo");

// toggles the class "foo"
el.classList.toggle("foo");