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The section headings in the article start at the second level (==Heading 2==), with subsections at the third level (===Heading 3===), and so on. Sections should not skip levels from sections to sub-subsections (e.g., a fourth-level subsection heading immediately after a second-level heading). See also. Introduction to formatting (Wiki markup)
There are 6 General Rules in all, which must be applied in consecutive order. GRI 1 prescribes how to classify products at the 4-digit Heading level, based on the wording of the headings and the relative HS Section and Chapter Notes.
An alphanumeric outline includes a prefix at the beginning of each topic as a reference aid. The prefix is in the form of Roman numerals for the top level, upper-case letters (in the alphabet of the language being used) for the next level, Arabic numerals for the next level, and then lowercase letters for the next level.
Very short sections and subsections clutter an article with headings and inhibit the flow of the prose. Short paragraphs and single sentences generally do not warrant their own subheadings. Headings follow a six-level hierarchy, starting at 1 and ending at 6. The level of the heading is defined by the number of equals signs on each side of the ...
The heading must be on its own line, with one blank line just before it; a blank line just after is optional and ignored (but do not use two blank lines, before or after, because that will add unwanted visible space). For technical reasons, section headings should: Be unique within a page, so that section links lead to the right place.
I also personally prefer to begin with the h2 section heading—when outlining in English (as in preparation for an academic paper or work of fiction), one does not start with an "A" (the equivalent of an h3 heading), but with the Roman numeral "I" (the top level/h2 heading). DocWatson42 05:30, 2 October 2007 (UTC) Agreed.
In modern texts, multilevel numbered headings are widely used. For example, the string "2.3.1.5" represents a 4th-level heading within chapter 2 (i.e., in the second chapter, the third subsection, the first sub-subsection and the fifth, the sub-sub-subsection).
Using {{TOC limit}} on this page would not hide header D, because even though it is a level-6 heading it is shown at the second level in the TOC. And it would hide header G even though it is a level-3 heading just like header B, because header G is shown at the third level in the TOC while header B is shown at the second level.