Sublime Text
<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> <style> div p:empty{ background-color:red; height:50px; } </style> </head> <body> <div> <p></p> <h1>HTML</h1> <h2></h2> </div> <p></p> </body> </html>
<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> <style> div p:empty{ background-color:red; height:50px; } </style> </head> <body> <div> <p></p> <h1>HTML</h1> <h2></h2> </div> <p></p> </body> </html>