BEIJING — China has released a circular demanding that online platforms not slander deceased heroes during the upcoming Qingming Festival, or Tomb-Sweeping Day, which falls on April 5 this year.

The circular, issued by the Cyberspace Administration of China, aims to standardize the management of online tomb-sweeping activities.

Online platforms are not allowed to spread vulgar, feudal, or superstitious information, said the circular, adding the platforms should promptly handle tipoffs from netizens.