You can enable dragging within a web page by changing the Drag Mode of your WebViewPrefab or CanvasWebViewPrefab to DragWithinPage:
The default Drag Mode is DragToScroll, which causes drag interactions to trigger scrolling, but changing the Drag Mode to DragWithinPage causes drag interactions to trigger dragging elements within a page instead. If you want drag interactions to trigger both scrolling and dragging within a page (like in a mobile browser), here are some options:
• For Android (non-Gecko) and iOS, you can enable Native 2D Mode, which enables native touch interactions.
• For Windows, macOS, and Android Gecko, you can implement touch interactions using the IWithTouch interface. WebViewPrefab and CanvasWebViewPrefab don't yet support touch interactions with IWithTouch out-of-the-box, but I have a feature request for that, and I'll update this article when I add support for that in the future.