cssText property

The cssText property allows you to set CSS styles in bulk in one line. In this case, the entire content of the style attribute is overwritten.

Syntax

element.style.cssText = 'property 1: value; property 2: value...'

Let's give an element some styles:

let elem = document.querySelector('#elem');
elem.style.cssText = 'color: red; font-size: 40px;';

In this example, an element will initially have styles in the style attribute, but the cssText property will overwrite it:

let elem = document.querySelector('#elem');
elem.style.cssText = 'color: red; font-size: 20px;';

To prevent previous styles from being overwritten, you can do this:

let elem = document.querySelector('#elem');
elem.style.cssText += 'color: red; font-size: 20px;';