OSR Testing h1 - Focus and blur
    
    this page and will get this red black
  
  
  - OnPaint should be called each time a page loads
- Move mouse
      to require an OnCursorChange call
- Hover will color this with
      red. Will trigger OnPaint once on enter and once on leave
- Right clicking will show contextual menu and will request
      GetScreenPoint
- IsWindowRenderingDisabled should be true
- WasResized should trigger full repaint if size changes.
      
- Invalidate should trigger OnPaint once
- Click and write here with SendKeyEvent to trigger repaints:
      
- Click here with SendMouseClickEvent to navigate:
      
- Mouse over this element will
      trigger show a tooltip
- SELECTED_TEXT_RANGE
    Drag here