how to change a Css Style Class definition with Javascript? [duplicate]

Question

Is it possible to override the Css Classes with JavaScript ? for exemple :

Adding a background to .iframe style classe.

Do you mean changing the background for all elements that have the iframe class? Just toggle another class name for those elements and define a CSS rule with the background for only that toggled class. — Sebastian Simon
– Sebastian Simon, Commented Sep 30, 2015 at 2:18

Filipe Merker · Accepted Answer · 2015-09-30 02:34:13Z

-1

Who is the troll

who down voted my answer? Please provide your reason

Changing a STYLE property

var iframe = document.querySelector('.iframe');
iframe.style['marginBottom'] = "200px";

Changing a CLASS property

iframe['className'] = "myClass";

answered Sep 30, 2015 at 2:27

Filipe Merker

2,4561 gold badge27 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

Didn't down vote but see e duplicate question what this was really about.