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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 50%; margin: 10px 0; border: solid black 1px; background-color: lightblue; block-size: 30px; } </style> </head> <body> <h1>Change block-size property with JavaScript</h1> <p>Click the "Try it" button to change the block-size values of the DIV element:</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> This is my DIV element. </div> <script> function myFunction() { document.getElementById("myDIV").style.blockSize = "100px"; } </script> </body> </html>