cannot access rules in external CSSStyleSheet

Question

I am having trouble figuring out why .cssRules and .rules won\'t work in my simplistic color generator project.

I have a <

Answer 1

As of Chrome 64, new CORS rules are enforced for stylesheets. You'll need to use a local development server to do local testing of functionality that depends on the CSS Object Model. For details, see Cannot access cssRules from local css file in Chrome.