Tantek Çelik

Hello
Hi. I work on web standards and the IndieWeb. I like to run trails, practice yoga, go bouldering, code & design my website, and write when I can. My pronouns are he/him. 🏠 📺 🥏
💬 Contact 👏 Tip Founder at IndieWeb Founder at microformats.org Web Standards Lead at Mozilla AC & CSS WG at W3C, and previously AB BSCS & MSCS Stanford University

Web site: https://tantek.com
🦋 tantek.com.web.brid.gy: https://bsky.app/profile/tantek.com.web.brid.gy/
micro.blog @t: https://micro.blog/t
@ Threads @tantek: https://www.threads.net/@tantek
Instagram @tantek: https://instagram.com/tantek/
Flickr: https://www.flickr.com/people/tantek/
Github @tantek: https://github.com/tantek
IndieWeb User:Tantek.com: https://indieweb.org/User:Tantek.com
Wikipedia User:Tantek: https://en.wikipedia.org/wiki/User:Tantek

Last Notes

2026-09-01 20:31:00 GMT

Welcome to September! Time for a new blogging challenge for the month. After some ideation, here’s my proposed September blogging challenge, on topics I find myself reading and posting about, with an emphasis on pragmatism:
The Web And Standards September Useful Posts blogging challenge
Or the #WASSUP challenge for short.
I really enjoyed the #Blaugust blogging challenge last month (31 posts ✅ — summary in another post), and not feeling a resonance with the two prior September challenges noted on the IndieWeb wiki, decided to come up with my own. Iterated on some ideas yesterday until arriving at WASSUP (yes, as a backronym, inspired somewhat by WHATWG which also has WHATNOT and WHATUP meetings).
Topic:
* Anything *useful* (features, tips) about open web standards, the open web as a whole, web browsers, or web services like search engines.
Hashtags:
* #WASSUP #WASSUP2026
Similar to Blaugust:
* Overall goal: 30 posts during the month of September (1 per day if you wish, or double/triple-up to get ahead or catch-up)
UPDATE: Awards for numbers of posts:
* 1 ⭐️ Starter. Congrats on starting the challenge!
* 5 ✨ Weekly Tipster. Post once per week, or at least 5 times for the duration.
* 8 🕸 Weekends Weaver. Post every weekend day, or at least that same number, 8 times.
(Thanks to James for this suggestion!)
* 22 ❇️ Weekdays Wizard. Post every weekday, or at least that same number, 22 times.
* 30 💠 Superbly Useful. Post at least 30 times during the month.
All self-assessed and self-acknowledged. Use the award name, emoji, or both!
And that’s it.
If those are topics you already blog about, great, join in using the hashtags and share what you find useful about them!
Otherwise, take a look at how you frequently use the Web, and post what you have found useful, especially the most useful for you.
Blog clever tips about how you have made better use of the Web, web browsers, search engines etc.
If you’re a web developer or designer, share what you find most useful about web standards, your choice, either in their entirety or of individual features, like HTML elements, attributes, CSS properties, Selectors, DOM features, WebAPIs, standard media formats on the web, etc.
Let’s see what positive pragmatic things we can share with each other about the web and how it works in practice.
Glossary:
Blaugust:
* https://indieweb.org/Blaugust
blogging challenge:
* https://indieweb.org/blogging_challenge
September blogging challenges:
* https://indieweb.org/September#Challenges
standards
* https://indieweb.org/standards
#blog #blogging #bloggingChallenge #September #web #openWeb #webStandards #openWebStandards #webDev #webDevs #webDeveloper #webDevelopers #webDesign #webDesigns #webDesigner #webDesigners #useful #pragmatic
This is post 20 of #100PostsOfIndieWeb. #100Posts #indieweb
← https://tantek.com/2026/243/t1/many-paths-indieweb-custom-domain
→ 🔮

2026-06-21 05:00:00 GMT

Tomorrow morning
once more into the woods
up the rocks, onto the ridges
[@brokenarrowskyrace.com](https://brokenarrowskyrace.com )
Goal: finish 23k
Live stream: https://m.youtube.com/watch?v=ZeYQprW-4u4
#BrokenArrowSkyrace #skyRace #trailRace #mountainRunning

2025-08-27 01:00:00 GMT

What are the things on your bucketlist that being a billionaire would make no difference?
When I was in Berlin at the end of last month, I was chatting with my pal Mo, and noted a sticker I’d seen that said “ELON MUSK DIDN’T GET INTO BERGHAIN” with a QR code that linked to: https://berlinguide.de/money-cant-buy-you-love-the-story-behind-elon-musks-berghain-rejection/
Mo has been to Berghain, and I shared that especially after hearing that a billionaire was rejected, I put it on my list: go clubbing at Berghain.
Having completed my responsibilities for July (hosting the W3C Advisory Board at Mozilla Berlin), I started to focus on my next big goal, finishing (or attempting to finish) a 50k that Sunday (3 days from then).
I realized those two goals had something in common: being a billionaire makes no difference to achieving them. Being a billionaire won’t help you achieve them.
You can’t buy your way into Berghain, you have to show up with an authentic vibe that feels right to the bouncers.
You can’t pay someone to do the work of running a 50k, you have to personally train consistently, train hard, show up, and run it yourself. Or any other race distance.
I told her these two things inspired me to come up with the idea of:
The anti-billionaire bucketlist (I’d prefer a better, positively framed phrase)
And filtered my prior goals accordingly.
She said I should post about it.
At the time I had only a few things in mind:
* Run the Skyline 50k (August 3rd)
* Get into Berghain
* Finish a 50 mile race
* Finish a 100km race
I checked that first one off (https://tantek.com/2025/216/t1/finished-skyline50k-ultra — still writing up my race report) and am reflecting on others.
What’s on your anti-billionaire bucketlist?

2024-10-11 21:22:00 GMT

⚠️ .io domain[¹](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-1 ) likely being phased-out[²](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-2 ) — seven suggested steps
Good article in The Verge summarizing recent .io related events, see that for more context if this is news to you:
* https://www.theverge.com/2024/10/8/24265441/uk-treaty-end-io-domain-chagos-islands
It looks likely .io (and .io domains) will go away in the next few years (as .cs and .yu did[³](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-3 )), so here are my suggested steps to take depending on your usage of .io domains:
1. Avoid buying new .io domains (or making plans with existing ones; sell if you can)
2. If you currently run a .io service[⁴](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-4 ) (for a company or community), make and publicize a transition plan (like a new domain, redirection, orderly shutdown plan for redirects)
3. If you have a personal site on a .io domain[⁵](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-5 ) or subdomain, make your own transition plan, and perhaps post about how others should link to your posts
4. If you are using someone else’s .io domain to publish (like #GitHubPages[⁶](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_note-6 )), make a transition plan to publish elsewhere and leave a forwarding note and link behind
5. If you use a .io domain as your Web sign-in login on any sites, switch them to another non-io personal domain
6. Similarly if your site accepts #WebSignIn logins (via #IndieAuth, #RelMeAuth, or even #OpenID), consider discouraging any new sign-ups from .io domains, and warning any existing users with .io domains to switch per # 5
7. If you have posts (or a whole #indieweb site) with links to .io sites or pages (like those in 2-4 above), make a plan for editing those links to point to an alternative or an archival copy (like on the Internet Archive)
And of course, post about your #dotIO plans.
Glossary
Domain
https://indieweb.org/domain
IndieAuth
https://indieweb.org/IndieAuth
Internet Archive
https://web.archive.org/
OpenID
https://indieweb.org/OpenID
Redirect
https://indieweb.org/redirect
RelMeAuth
https://indieweb.org/RelMeAuth
Web sign-in
https://indieweb.org/Web_sign-in
References:
[¹](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-1 ) https://indieweb.org/.io
[²](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-2 ) https://en.wikipedia.org/wiki/.io#Phasing_Out
[³](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-3 ) https://en.wikipedia.org/wiki/.cs
[⁴](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-4 ) E.g. https://indieweb.org/webmention.io or https://indieweb.org/granary.io
[⁵](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-5 ) E.g. https://indieweb.org/werd.io
[⁶](https://tantek.com/2024/285/t1/io-domain-suggested-steps#t5ZT1_ref-6 ) https://indieweb.org/github.io
This is post 25 of #100PostsOfIndieWeb. #100Posts
← https://tantek.com/2024/283/t1/metaphors-constructive-cooperative-joyful
→ 🔮

2024-09-04 01:47:00 GMT

Twenty years ago this past February, Kevin Marks and I introduced #microformats in a conference presentation.
Full post: https://tantek.com/2024/044/t1/twenty-years-microformats
Aside: This is an even shorter summary of that post from ~200 days ago, which #Mastodon readers never got due to a Mastodon #federation bug (details in https://tantek.com/t5Yo1).
Since early 2023, here are the top three updates & interesting developments in microformats:
1. Growing rel=me adoption for distributed verification (✅ in Mastodon etc.)
* Wikipedia, Threads, [omg.lol](http://omg.lol )
2. Proposal to merge #microformats2 h-review into h-entry, since in practice (e.g. on #indieweb) reviews are just entries with a bit more.
3. #metaformats adoptions, implementations, iteration

2024-08-24 23:56:00 GMT

People over protocols over platforms.
inspired by today’s #indieweb #fediverse #ActivityPub #decentralized #socialMedia lunch meetup at #XOXO #XOXOConf (@npub19rw…zsgh)
This is post 16 of #100PostsOfIndieWeb. #100Posts
← https://tantek.com/2024/173/t1/years-posse-microformats-adoption
→ https://tantek.com/2024/238/t1/indiewebcamp-portland