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<!DOCTYPE html> <html> <head> <style> #myDIV { margin-top: 20px; inline-size: 70%; block-size: 200px; background-color: lightgreen; border-block: 1px solid black; } </style> </head> <body> <h1>Change border-block with JavaScript</h1> <p>Click the "Try it" button to change the border-block property of the DIV element:</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> <h1>Hello</h1> </div> <script> function myFunction() { document.getElementById("myDIV").style.borderBlock = "dashed hotpink 10px"; } </script> </body> </html>