css variable from javascript code example
Example 1: javascript get css variable
let docStyle = getComputedStyle(document.documentElement);
let myVarVal docStyle.getPropertyValue('--my-variable-name');
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: set css variable from javascript
document.documentElement.style.cssText = "--tab-count: 3";
/or/
document.documentElement.style.setProperty("--tab-count", 5);
/or/
document.documentElement.setAttribute("style", "--tab-count: 5");