Right now we use codemirror's JavaScript mode on the website but there's a JSX mode now so we should start using that instead.

if (d.inaccurateSelection) {
        d.prevInput = "";
        d.inaccurateSelection = false;
        d.input.value = cm.getSelection();
        selectInput(d.input);
      }
    }
    on(d.input, "cut", prepareCopy);
    on(d.input, "copy", prepareCopy);
    
    if (khtml) on(d.sizer, "mouseup", function() {
        if (document.activeElement == d.input) d.input.blur();
        focusInput(cm);
    });
  }
  function eventInWidget(display, e) {