Get a CSS value with JavaScript

Question

I know I can set a CSS value through JavaScript such as:

document.getElementById(\'image_1\').style.top = \'100px\';

But, can I

Answer 1

In 2020

check before use

You can use computedStyleMap()

The answer is valid but sometimes you need to check what unit it returns, you can get that without any slice() or substring() string.

var element = document.querySelector('.js-header-rep');
element.computedStyleMap().get('padding-left');

var element = document.querySelector('.jsCSS');
var con = element.computedStyleMap().get('padding-left');
console.log(con);

.jsCSS {
  width: 10rem;
  height: 10rem;
  background-color: skyblue;
  padding-left: 10px;
}