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A Beginner's Guide to HTML and CSS on AO3 by the_untamed_poet25
Fandoms: No Fandom, Fandom - Fandom, AO3, Original Work
03 Aug 2026
Tags
Summary
You've seen it. A fic formatted like a classified document. A chapter that looks like a real social media feed. An interactive game, somehow, inside an AO3 work. You clicked the kudos button. You thought: how.
This is the tutorial that answers that.
A beginner-friendly guide to HTML and CSS on AO3 — no prior coding experience required. By the end of this series, you'll know enough to write formatted fics, build your own workskins, style your entire AO3 interface, and maybe make something that makes other people stop and think how.
Series
- Part 23 of Izzy's HTML & CSS Experiments
- Part 2 of HTML/CSS AO3 Skins & Tutorials
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Summary
For anyone who wishes AO3 had dark mode, I have great news! Dark mode has been possible since 2013, you just need to know how to apply it.
Even better news? It's easier now than it ever has been before. Tutorial inside.
You need to be logged into an AO3 account for this to work.
Series
- Part 5 of How to AO3
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Summary
There are some great quick-and-dirty guides to HTML on A03. This is not one of them - it is a comprehensive guide
It's now 2025, a decade later. A03 supports some new HTML and and we're all walking around reading fic on supercomputers that fit in a jean pocket. It was time to update.
The previous three chapters have been divided into smaller concepts. Each tag continues to 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. Most tags have their attributes, things like [src] or [title], listed and examples of how using the attributes modify the tags.
There's a chapter on Bad Ideas, including how some of the archive's default CSS is available to you to format your work (users can't turn that off by hiding a workskin!)
Oh. And I added a bunny army. You could learn how to add one too.
/)/) /)/) /)/) (..) (..) (..) *( ) *( ) *( )
Series
- Part 19 of AO3 Work Skins/Tutorials