You can edit / change the code and click run button
<!DOCTYPE html> <html> <head> <title>HTML iFrame</title> </head> <body> <h2>Example HTML iFrame frameborder</h2> <iframe src="../html-headings" width="300" height="300" frameborder="1"> </iframe> <p>Try changing the frameborder="0"</p> <b>Note: HTML 4 only support</b> </body> </html>