This exposes the hidden structure.
The design looks right but you need to see the actual H1–H6 structure underneath it.
Website & SEO
See the heading structure hiding under the design.
Fetch a public page and list its H1–H6 outline so skipped levels and missing H1s are obvious.
Useful to know
Four things worth knowing.
Neat maths can still look wrong.
A visually large line is not automatically a heading, and heading levels are not chosen for font size.
Check it where people see it.
Look for a clear page topic, sensible nesting and accidental skipped or duplicated heading levels.
Optical judgement still matters.
Use CSS for appearance and heading elements for document structure.