There are three types of pre-defined headers. H2, H3 and H4. H2 and H3 are showed in the section content. All three header levels are displayed in the topic content. <h1> is reserved for the title of the topic in accordance with the MDN recomendations: "While using multiple <h1> elements on one page is allowed by the HTML standard (as long as they are not nested), this is not considered a best practice. A page should generally have a single <h1> element that describes the content of the page (similar to the document's <title> element)." Also consider the MDN recommendation and avoid: <h1>Heading level 1 </h1> <h3>Heading level 3 </h3> <h4>Heading level 4 </h4> while using the headers in their natural order: <h1>Heading level 1 </h1> <h2>Heading level 2 </h2> <h3>Heading level 3 </h3>
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