!^+v::
Sleep 50
SendSafe("+{F4}")  ; Instead of this line and the next few lines, you should use the hotkey that opens the web console or browser console. And test whether it opens with the input thingy in focus.
WinWait, Scratchpad, , 2
If ErrorLevel
{
    Msgbox No Scratchpad found.
    Return
}


ClipboardSwapping = 1
Old := clipboardall
Clipboard =
(  ;js
  // your Javascript goes here
)

SendSafe("^v")
SendSafe("^r")
Sleep 200
SendSafe("^z")
SendSafe("!{F4}")

Clipboard := Old
Sleep 100
ClipboardSwapping = 0
Return


SendSafe(Key){
    static SendSafeActive := 0
    ; FileAppend, % "================= " SendSafe "`n", *
    ; If (SendSafe_ActiveKey)
        ; FileAppend, % A_LineNumber S:  endSafe_ActiveKey " is still active.`n", *
    While GetKeyState("Control")
       or GetKeyState("Alt")
       or GetKeyState("Shift")
       or GetKeyState("LWin")
       or GetKeyState("RWin")
       or (SendSafeActive = 1)
    {
        Sleep 20
        If ( A_Index > 50) {  ; Wait for 1 second, then give up
            Soundbeep 300, 100
            Soundbeep 150, 500
            Return
        }
    }
    SendSafeActive := 1
    Send % Key
    SendSafeActive := 0
}