When I add script code in wordpress' text editor, nothing shows up

For example this code:

https://www.w3schools.com/code/tryit.asp?filename=GN64U1L3MB4D

It’s a working code as you can see, but when I add it in the "text" page NOT the "visual" tab in wordpress’s post’s editor, nothing shows up in the preview.

Should I add something or what?

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