Source Code:
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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> <style> #color { transition-property: background-color; transition-duration: 5s; } </style> </head> <body> <button id="color">Click on button</button> <script> color.onclick = function() { this.style.backgroundColor = 'green'; }; </script> </body> </html>
Result:
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