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<!DOCTYPE html> <html> <head> </head> <body> <p>Click the button to create a STYLE element, and place it in the head section.</p> <button onclick="myFunction()">Try it</button> <p>The created style element contains css declarations that will change the font properties of this document.</p> <script> function myFunction() { var x = document.createElement("STYLE"); var t = document.createTextNode("body {font: 20px verdana;}"); x.appendChild(t); document.head.appendChild(x); } </script> </body> </html>