how to access css variables in javascript code example
Example 1: how to change a css variable with javascript
var root = document.querySelector(':root');
root.style.setProperty('--variable', 'lightblue');
/or/
root.style.setProperty('--variable', myColor);
Example 2: javascript get css variable
let docStyle = getComputedStyle(document.documentElement);
let myVarVal docStyle.getPropertyValue('--my-variable-name');
docStyle.setProperty('--my-variable-name', '#fff');
Example 3: change css variable with javascript
let root = document.documentElement;
root.addEventListener("mousemove", e => {
root.style.setProperty('--mouse-x', e.clientX + "px");
root.style.setProperty('--mouse-y', e.clientY + "px");
});