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<!DOCTYPE html> <html> <head> <style> #ex1 { color: red; } </style> </head> <body> <h1>The setProperty() Method</h1> <p>Click the button to modify an existing CSS property.</p> <button onclick="myFunction()">Try it</button> <div id="ex1">Some text.</div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>