HTML - (Document) Outline

1 - About

The outline also known as the table of content is a list of one or more potentially nested sections.

See also: UI - Table of Content (ToC) / Outline

Sectioning roots elements can have their own outlines, but the sections and headings inside these elements do not contribute to the outlines of their ancestors. (blockquote, body, details, dialog, fieldset, figure, td)

3 - Check

You can check the outline with the w3 validator by checking the outline option.

4 - Documentation / Reference

Data Science
Data Analysis
Data Science
Linear Algebra Mathematics

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