JavaScript—one of the core technologies for Frontend development
JavaScript is one of the most used Frontend technologies together with HTML and CSS.
Sweet Alert—customizable JS pop-up messages
Sweet Alert is an elegant alternative to plain JavaScript alert messages. It is often used to make the user understand that an action has been completed, if there is an error, or the implications of an action about to be taken.
Ulrik Mynthe
HTML—the standard markup language for web programming
HTML in its most current form, HTML 5, is the most widely used standard markup language used for web applications.