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<!DOCTYPE html> <html> <head> <style> #p1 { background-color: yellow; } </style> </head> <body> <h1>The opacity Property</h1> <p id="p1">Select a value from the list below, to change this element's opacity!</p> <select onchange="myFunction(this);" size="5"> <option>0 <option>0.2 <option>0.5 <option>0.8 <option selected="selected">1 </select> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>