Read more on how to extend the OutSystems UI with HTML here.

At the user interface level, the platform provides a rich visual editor that allows web interfaces to be composed by dragging and dropping. Instead of purely writing HTML, developers use visual widgets. These widgets are wrapped and are easy to reuse just by dragging and dropping without everyone needing to understand how they are built.

Read more on how to extend the OutSystems UI with Javascript here.

OutSystems provides a very simple to use AJAX mechanism. However, developers can also use JavaScript extensively to customize how users interact with their applications, to create client side custom validations and dynamic behaviors, or even to create custom, very specific, AJAX interactions. For example, each application can have an application-wide defined JavaScript file or set of files included in resources. Page-specific JavaScript can also be defined.