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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 300px; margin-top: 20px; background-color: lightgreen; border-block-start-width: 10px; border-block-start-style: solid; border-block-start-color: black; } </style> </head> <body> <h1>Change border-block-start-color with JavaScript</h1> <p>Click the "Try it" button to change the border-block-start-color property of the DIV element:</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> <h1>Hello</h1> </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>