What is the principle of h=5?

Is a widely used guiding principle in information design and typesetting.

H=5 principle is a guiding principle widely used in information design and typesetting, which means that in information design, the font size of the title is 5 units larger than the text.

H=5 principle is widely used in various information design scenarios, including web page design, document typesetting, poster design and so on.