In Dynamics 365 for Finance and Operations, typically, you use existing control to design the user interface. However, developers using modern tools such as HTML5, CSS3, and jQuery can also define entirely new controls to provide specific visualizations for business data.
For more details, visit Microsoft's documentation on creating new controls: https://docs.microsoft.com/en-us/dynamics365/operations/dev-itpro/user-interface/control-extensibility.
Some sample code is also available on GitHub so that you can learn how to create extensible controls: https://github.com/Microsoft/Dynamics-AX-Extensible-Control-Samples.
Some sample code is also available on GitHub so that you can learn how to create extensible controls: https://github.com/Microsoft/Dynamics-AX-Extensible-Control-Samples.