This is a simple web application for Creating a list of books with Author and Title, you can also add, remove and display diferent type of information in one single page.
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Really nice code layout! I like that your main JS is only a few lines of code. Under 30 lines, wow!
Considerations
It is possible to maybe use one more class to hold those global variables and the display method that you have. The only purpose for that would be to just clean up the code a little bit more. All things considered, everything looks great so this feedback is simply for aesthetics rather than functionality.