Editing User interface markup language (section)

{{More citations needed|date=January 2024}}{{Short description|Language that describes user interfaces}}
{{Use dmy dates|date=October 2024}}
A '''user interface markup language''' is a [[markup language]] that renders and describes [[graphical user interface]]s and controls. Many of these markup languages are dialects of [[XML]] and are dependent upon a pre-existing [[scripting language]] engine, usually a [[JavaScript]] engine, for rendering of controls and extra scriptability.

The concept of the user interface markup languages is primarily based upon the desire to prevent the "[[reinventing the wheel|re-invention of the wheel]]" in the design, development and function of a user interface; such re-invention comes in the form of coding a script for the entire user interface. The typical user interface markup language solidifies [[reusability|often re-used]] program or script code in the form of markup, making it easier to focus upon design of a user interface in an understandable dialect as opposed to focus on function.

User interface markup languages, like most markup and programming languages, rely upon sub-application [[Run-time system|runtime]]s to interpret and render the markup code as program code that can be processed and put out in the desired form. In XML-based user interface markup languages, the markup is usually interpreted and represented as a tree of nodes that may be manipulated at runtime by the application's code or dynamically loaded user [[script (computer programming)|script]].