One more comment on this. Adobe XD is a tool that provides a means to create, illustrate and animate your designs and prototypes.
Web Export takes those graphics and converts them into web page elements.
The input slider or input range is a user interface element that a person uses to interact with a form to gather data. So in Adobe XD the slider is so far only a graphic.
Web Export doesn’t provide any form elements or user interface components but it can create them by changing the tag name or using prebuilt user interface components.
How exporting works
However, there are prebuilt components that you can use like Materalize CSS and the native HTML elements but they are not automatically skinned. Skinning is the term used to describe changing the visual appearance of an object but retain the underlying behavior.
So what this means is that right now, the slider is just a graphic. It has to be exported as an existing HTML element that has the behavior you want.
One of the goals of Web Export is to provide full skinning and component support and support existing libraries that do this. There are a few hurdles with that in that the Adobe XD API does not allow traversal of Adobe XD Components (Symbols). I can only parse the XD Component in it’s selected state in XD.
A new feature is in development that will make some of this more simple and allow you to easily create your own components and modify them visually across projects.