IMGUI Support

Use the IMGUIContainer to place IMGUI code inside of a VisualElement. Everything you can do inside of OnGUI() is supported.

You can arrange multiple IMGUIContainer and lay them out by mixing GUILayout and UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Toolkit layouts. Note that it’s not possible to add VisualElement instances inside of an IMGUIContainer.