HTMHell Advent Calendar 2025

In 2022, I launched the HTMHell Advent Calendar, which was a great success. Since then, dozens of authors worldwide have contributed fantastic articles on security, accessibility, UX, and performance every year. This year, we're back again with twenty-four more posts.

Starting December 1st, I'll publish them one by one every day.

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  1. 1
    Top layer troubles: popover vs. dialog by Stephanie Eckles
  2. 2
    Using the Ancient Evils for Debugging by Manuel Strehl
  3. 3
    Speculation rules improvements by Barry Pollard
  4. 4
    Referencing HTML elements inside Shadow DOM by mehm8128
  5. 5
    IDREFs: What they are and how to use them by Kilian Valkhof
  6. 6
    Accessible by Design: The Role of the 'lang' Attribute by Todd Libby
  7. 7
    Controlling dialogs and popovers with the Invoker Commands API by Aubrey Sambor
  8. 8
    What's wrong with this HTML, and is it valid? by Patrick Brosset
  9. 9
    Discover Dialog by Sara Joy
  10. 10
    a11y freedom beaver by Steve Faulkner
  11. 11
    How HTML changes in ePub by Robin Whittleton
  12. 12
    A11y Considerations in Math on the Web by Manuel Sánchez
  13. 13
    Hell is other people's markup by Ian Lloyd (Lloydi)
  14. 14
    The Wonderful World of Web Feeds by Maureen Holland
  15. 15
    Them’s the Breaks by Tyler Sticka
  16. 16
    Giving pages a clear shape by using headings by Steve Barnett
  17. 17
    Don't leave the screen reader hungry by Geri Reid
  18. 18
    Forms are a badly designed part of HTML by Jens Grochtdreis
  19. 19
    Semantics beyond the tag name by Nathan Knowler
  20. 20
    The many lives of the page title by Katrin Kampfrath
  21. 21
    Styling by Language: Using the lang Attribute for Multilingual Design by Julia Undeutsch
  22. 22
    The HTML Elements Time Forgot by Declan Chidlow
  23. 23
    For the Love of <details> by Justin Ferrell
  24. 24
    The three semantics of HTML by Tomasz Jakut

Bonus articles

  1. 25
    Abbreviations done right: The <abbr> element and why not use it by Alexander Muzenhardt
  2. 26
    Class names for content not design by Darice de Cuba
  3. 27
    Replacing JS with just HTML by Aaron T. Grogg
  4. 28
    HTML Input Validation is (maybe) Good by Wes Goulet

You can check out last year's posts or the first unofficial calendar, which only links to existing articles on other sites.

  1. HTMHell Advent calendar 2024
  2. HTMHell Advent calendar 2023
  3. HTMHell Advent calendar 2022
  4. HTMHell Advent calendar 2021