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<!DOCTYPE html> <html> <head> <style> p:only-child { background: #ff0000; } </style> </head> <body> <div><p>This is a paragraph.</p></div> <div><span>This is a span.</span><p>This is a paragraph.</p></div> <p><b>Note:</b> Internet Explorer 8 and earlier versions do not support the :only-child selector.</p> </body> </html>