css variables in js code example
Example 1: javascript get css variable
let docStyle = getComputedStyle(document.documentElement);
//get variable
let myVarVal docStyle.getPropertyValue('--my-variable-name');
//set variable
docStyle.setProperty('--my-variable-name', '#fff');
Example 2: how to change css variable in javascript
document.documentElement.style.setProperty("--main-background-color", "green");
Example 3: how to change css variable in javascript
document.documentElement.setAttribute("style", "--main-background-color: green");