HTML code work perfectly in JS bin editor but not in a new SharePoint page HTML - html

I have a problem, a page in HTML code works well in W3Schools and JS Bin editors, but does not work when it is on page of SharePoint
The HTML code Test Page
The dropdown and the button Berechnen are working well but in SharePoint the DropDown doesnot work, but the Berechnen Button work well.
The HTML code ist the same as the link hier and on the SharePoint Page.
Thank you.

Keep your javascript after html and add everything in Content editor webpart it should work or give path of html page to content editor webpart.

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