Obtrusive JavaScript has no non-JavaScript alternative and therefore renders a feature inaccessible to users with JavaScript disabled or unavailable in their browsers. Such users include the visually impaired (who use special browsers) and employees of corporations which strip JavaScript from pages and/or disable it in the browser for security reasons. The first step to unobtrusive JavaScript is to build the page without client-side scripting, and make sure it works. Any server-side logic that JavaScript will need to use should be kept in separate script files than the alternative pages. };