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<html><title>W3.JS</title><script src="https://www.w3schools.com/lib/w3.js"></script><body><h2>Testing W3.JS in HTML</h2><p>Elements with a class="city" will behave like a slideshow:</p><h1 class="city">London</h1><h1 class="city">Paris</h1><h1 class="city">Tokyo</h1><script>w3.slideshow(".city");</script></body></html>