A bare minimum HTML page demonstrating use of CSS and JavaScript.

See also React Starter. DevTools failed to load source map: Could not load content for https://s.yimg.com/cb/af/adfeedback.js.map: HTTP error: status code 403, net::ERR_HTTP_RESPONSE_CODE_FAILURE DevTools failed to load source map: Could not load content for https://static-int.adsafeprotected.com/visJS.append.js.map: Connection error: net::ERR_NAME_NOT_RESOLVED 2DevTools failed to load source map: Could not load content for https://static-int.adsafeprotected.com/4a.js.map: Connection error: net::ERR_NAME_NOT_RESOLVED