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Non-required / best practice
- Text that acts as a heading visually or structurally SHOULD be designated as a true heading in the markup.
- Text that does not act as a heading visually or structurally SHOULD NOT be marked as a heading.
- Heading text SHOULD be concise and relatively brief.
- Headings SHOULD convey a clear and accurate structural outline of the sections of content of a web page.
- Headings SHOULD NOT skip hierarchical levels.
- The beginning of the main content SHOULD start with <h1>.
- Most web pages SHOULD have only one <h1>.