> Markdown version of [/magazine/670-10-holiday-calendars-to-keep-you-busy-learning-various-technologies-in-december-web-security-a11y-performance](https://www.wearedevelopers.com/magazine/670-10-holiday-calendars-to-keep-you-busy-learning-various-technologies-in-december-web-security-a11y-performance). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

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# 10 holiday calendars to keep you busy learning various technologies in December (web, security, a11y, performance…) 

**By:** [Chris Heilmann](https://www.wearedevelopers.com/@chris-heilmann)

**Published:** December 4, 2025

Every December, developers and companies offer holiday calendars with daily technical articles and challenges. This is a lot of work and there is a ton of excellent content to be discovered. Here are some of the ones we read daily and check out. Why don’t you join us?

- [AdventJS](https://adventjs.dev/en) is a daily JavaScript challenge to solve and hone your skills.
- [HTMHell Advent Calendar](https://www.htmhell.dev/adventcalendar/) is Manuel Matuzović’s daily piece of HTML and web development advice with lots of guest writers.
- [Advent of Code](https://adventofcode.com/) has a daily development challenge
- [Advent of A11Y](https://www.manuelsanchezdev.com/advent-2025) learn how to make your web content more accessible.
- [24 days of accessibility](https://www.freelock.com/advent/2025) is a daily explainer of different parts of the WCAG guidelines.
- [Hex Advent 2025](https://hex-advent.starlabs.sg) is a Christmas Special CTF by women, for women.
- [CSS calendar](https://cssadventcalendar.dev/) has a daily CSS trick.
- [C# Advent Calendar](https://csadvent.christmas) allows you to see better, or to write code in C#…
- [24 pull requests](https://24pullrequests.com/) get you started in contributing to open source.
- [Web Performance Calendar](https://calendar.perfplanet.com/2025/) is all about making the experience of our users snappier.

You will more than likely find some of these links in the Dev Digest and we will discuss some of them in our live show. We want to thank all of the lovely people who wrote, coded and created all that content and the ones curating these calendars. People to people information is so much more enjoyable than an AI overview that may or may not be correct.



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