We regularly scan websites to study how different industries structure their content. Here are selected case studies.
The Mozilla Developer Network is a gold standard for technical documentation. Its heading hierarchy is meticulously organized to support both scanning and deep reading.
A long-form publication with complex articles. The heading structure tends to run deeper (H4 is common) because tutorials require granular breakdowns.
The World Wide Web Consortium publishes specifications with highly formal heading structures. Every section is numbered and nested predictably.
A resource site for front-end developers with a mix of quick tips and deep dives. The heading depth varies by content type.