only-of-type (:only-of-type)
The only-of-type CSS pseudo-class represents any element that has no siblings of the given type.
Example
<!DOCTYPE html> <html> <head> <style> p:only-of-type { background: #ff0000; } </style> </head> <body> <div> <p>This is a paragraph.</p> </div> <div> <p>This is a paragraph.</p> <p>This is a paragraph.</p> </div> </body> </html>