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<!DOCTYPE html> <HTML> <head> <title>Title of the document</title> <style> #:\1w3dosc { color: #666; } </style> </head> <body> <h1 id=":\1w3docs">Example</h1> <button onclick="displayResult()"> Click here </button> <script> function displayResult() { document.getElementById( ":\1w3dosc") .innerHTML = "Hello world!"; } </script> </body> </html>