This test is designed for programmers to measure their proficiency in using pure JavaScript to design and develop dynamic web pages and web applications. This test is specific to the features of client-side JavaScript. It is written to the ECMAScript 2019 release of the language (also known as ECMAScript 10). Additional JavaScript libraries and back-end frameworks are covered in separate tests. A separate test for pure, general JavaScript that works in both client-side and server-side environments is also available, titled JAVASCRIPT.