When writing synchronous JavaScript code, a reasonable expectation from developers ... external object that the function or nested function has access to). Async/await syntax improved in ergonomics of ...

If you click the "Test JavaScript" button, then the text box below it should show 'Yes, JavaScript is enabled.' After you click it, if the text is showing "enabled", then assume JavaScript is running.

dash.js is a JavaScript based implementation for the playback of MPEG DASH content in browser based environments that support the Media Source Extensions and the Encrypted Media Extensions.