Strict Heading Hierarchy
Headings that nest logically by level, never skipping a level for visual reasons or borrowing a heading tag to style a widget.
Analogy Mental model
A book's table of contents. When the outline is incoherent, the chapters get filed under the wrong parent.
In practice What you actually do
Retrieval systems typically split on heading boundaries and prepend the heading chain to each fragment as context. That makes heading quality structural rather than cosmetic: write each one as a complete, specific statement, since a bare label arrives as a label with no meaning.
Where people get burned Pitfalls
Promotional slogans, pop-up titles, and footer column names must never occupy heading tags, however convenient the styling. Every one of them corrupts the outline that the splitter depends on.
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