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<!DOCTYPE html> <html> <body> <p>Hello World!</p> <p class="intro">The DOM is very useful.</p> <p class="intro">This example demonstrates the <b>getElementsByClassName</b> method.</p> <p id="demo"></p> <script> var x = document.getElementsByClassName("intro"); document.getElementById("demo").innerHTML = 'The first paragraph (index 0) with class="intro": ' + x[0].innerHTML; </script> </body> </html>