<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Split panels</title> <script type="text/javascript" src="https://unpkg.com/split.js/dist/split.min.js"></script> </head> <body> <div> <div id="one">content one</div> <div id="two">content two</div> <div id="three">content three</div> </div> </body> <script type="text/javascript"> window.onload = function() { Split(['#one', '#two'], { sizes: [25, 75], minSize: 200 }); }; </script> </html>