Why won’t the “div”s disappear?

Question

I am new and making a project, but I have hit a roadblock. I made this demonstration to show my problem. I have already tried:

-Turning the opacity to 0.0
-Adding “.style”
-Moving the “div”s off of the page
-Rearranging the order of the code

How do I make the red rectangle disappear when it is clicked?

https://code.sololearn.com/WjRXII7LxJVO/?ref=app

Answer 1

document.getElementsByTagName returns an array, so it considered ".display" as an array attribute, which is not the case.

You should select only the first element, using document.getElementsByTagName[0], here is the code:

https://code.sololearn.com/Wo8Oy3wcUiZF/?ref=app