Web Reference: CSS variables have access to the DOM, which means that you can change them with JavaScript. Here is an example of how you can create a script to display and change the --primary-bg-color variable from the example used in the previous pages. Sep 12, 2018 · Here’s a CSS variable (formally called a “ CSS custom property “): Perhaps you use them to set a position: To update those values from JavaScript, you’d: root. style.setProperty('--mouse-x', e. clientX + "px"); . root. style.setProperty('--mouse-y', e. clientY + "px"); }); That’s all. Mar 20, 2018 · It turns out changing CSS variables is possible using the el.style.cssText property, or el.style.setProperty or el.setAttribute methods. In your code snippets, el.setAttribute is incorrectly used, which is causing the error you encountered.
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