CLICK ANYWHERE IN THIS MAIN AREA TO MAKE THE TEXT INVISIBLE AGAIN.

To display and hide text, click alternately in the input window and this main body to change the focus back and forth. This method can be used to control the visibilty of annotation

When the document loads, the text is invisible because both the text and the background are the same color (white). When the user clicks the input button, the main area loses focus (called "blur") and this condition and changes the background color to make the text visible.

By reversing the colors, the same method could be used to make unwanted text invisible.