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There are some great quick guides to HTML on A03. This is not one of them - it is a comprehensive guide, dividing all of the available tags into the following categories:
1. Text Formatting (in-line HTML)
2. Page Formatting (block HTML)
3. Tables and Lists
4. Links and Images
Each tag will have - at a minimum - a link to the w3schools page about it (so you can learn more), a code example, and the result of the code example.
It will also introduce tag attributes, ways to further refine formatting, for a few simple - but widely applicable - cases.
Bookmarked by 1lostone
23 Jun 2017
Bookmarked by barelycoherent
5 Sep 2016
Just a quick and dirty HTML reference for AO3, with references to CSS style, HTML style, and other guides.