Online HTML Editor

<!DOCTYPE html> <html> <head> <style> p:only-child { background: orange; } </style> </head> <body> <h1>Heading</h1> <div> <p>This is a paragraph.</p> </div> <div> <p>This is a paragraph.</p> <p>This is a paragraph.</p> <p>This is a paragraph.</p> </div> </body> </html>