Can I go to China with HK ID?

I'm curious about a travel-related matter concerning a Hong Kong ID. Specifically, I'm wondering if someone holding a Hong Kong ID is able to travel to China without any hindrances or special requirements? I understand that there are often visa and passport regulations in place for international travel, but given the unique relationship between Hong Kong and China, I'm hoping there might be some flexibility in this case. Could you please clarify the situation for me and provide any necessary details or steps I should take to ensure a smooth travel experience? Thank you in advance for your assistance.