As the title suggests I tried both the IMGUIContainer as well as make a custom ImmediateModeElement and with both of them I couldn't get the coordinates to work. it's as if they're "off" by 20 pixels in the y axis? Though even that isn't consistent as I move the elements around so I ended up giving up. I used version "0.0.4-preview" of the runtime module in Unity 2020.1.0b14. As a example I used this code as the onGUIHandler: Code (CSharp): Rect drawRect = new Rect(); drawRect.y = -20; drawRect.size = new Vector2(100, 100); GUI.DrawTexture(drawRect, Texture2D.whiteTexture); And it ended up looking like this (the IMGUIContainer has a black background so you can see how a part of the rect was cut off even though it should still be on the container): Now that I'm already making a thread I also want to mention another hurdle I stumbled upon: I couldn't make a custom element to show textures (any texture, not just Texture2d, I needed RenderTextures), not just because of the aforementioned bug, but also because it seemed impossible to serialize a reference to a complex datatype like a texture in a straightforward way? All of that being said I really like the tool so far, especially how clean the editor is and how it doesn't fight against you in the way that many HTML editors do. It's just a clean way of conveying you the data in the text files and giving you a preview. Excited to see it developed further, bugs fixed and the documentation expanded!!