I tried including the 'tab.html' and ‘content.html’ into my 'index.html' (using w3school code: how to include HTML, found at: https://www.w3schools.com/howto/howto_html_include.asp), but the javascript and css elements do not work. The buttons don't work as intended. Look at: https://rads-198409.appspot.com
If you minimize the browser window, the tab is supposed to change to a drop-down menu, but the button does not work at all. I have checked the individual pages and they seem to work just fine, just not when they are combined.
Am I doing something wrong? Could someone help? All th