Correlates the number of search term matches in the web page H1 to H6 tags as a factor.
This factor correlates the number of search term matches in H1,H2,H3,H4,H5, and H6 tags (in the HTML source) with rankings.
The matches include only those that exacly match the target search terms.
You can learn more about the targeted zone for this factor at: https://www.w3schools.com/tags/tag_hn.asp.
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