<!DOCTYPE html> <html> <head> <style> * { color: red } </style> <style id="t"></style> </head> <body> <span class="test">This text should be green</span> <script> document.getElementById("t"). appendChild(document.createTextNode("* { color: ")); document.getElementById("t"). appendChild(document.createTextNode("green }")); document.getElementById("t").normalize(); </script> </body> </html>