MainWinClass = Chrome_WidgetWin_1
ControlClass = Chrome_RenderWidgetHostHWND1

Loop {
   If WinActive("ahk_class " . MainWinClass) {
      MouseGetPos,,,,  ControlM
      ControlGetFocus, ControlF, A
      If ControlM  = %ControlClass%
      If ControlF != %ControlClass%
       ControlFocus, %ControlClass%, A
   }
   Sleep, 10
}

window := "blah-blah"
class := "blah-blah"

loop
{
   WinWaitActive, % window
   WinGet, ControlList, ControlListHwnd
   Loop, Parse, ControlList, `n
   {
      WinGetClass, ControlClass, ahk_id %A_Loopfield%
      If (ControlClass = class)
      {
         WinActivate, ahk_id %A_Loopfield%
         WinWaitActive, ahk_id %A_Loopfield%
         break
      }
   }
}

loop {
MouseGetPos, OutputVarX, OutputVarY, OutputVarWin, OutputVarControl
if OutputVarControl = Chrome_RenderWidgetHostHWND1
Click
Sleep 10
}
return

MouseGetPos, OutputVarX, OutputVarY, OutputVarWin, OutputVarControl
MsgBox % OutputVarControl