Jan van Hellemond's Avatar

Jan van Hellemond

@jvhellemond.nl

Man who sold the world and is currently chasing payment.

11
Followers
16
Following
32
Posts
07.11.2024
Joined
Posts Following

Latest posts by Jan van Hellemond @jvhellemond.nl

No fax machine? πŸ˜’

02.03.2026 13:43 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
Boycot het Trump-WK in de VS Nu deelnemen aan een sportevenement alsof er niets aan de hand is, legitimeert Trumps expansieve politiek. Laat ons land en onze voetballers aan de goede kant van de geschiedenis staan. Hou onze jongens thuis. Deze campagne is gestart nav een column in Vrij Nederland, zie de link hieronder.

Let's not go to the World Cup.

NL only.

https://actie.degoedezaak.org/petitions/boycot-het-trump-wk-in-de-vs-1

24.01.2026 23:22 πŸ‘ 15 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

Ik ga aanstonds iemand ontbieden. #plotsklaps

14.01.2026 11:57 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

πŸ‘‹

12.12.2025 18:36 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Does the Trump phone exist yet? No, it does not.

I bought another domain name:
doesthetrumpphoneexistyet.com

If the yanks fasc would still let me into the country for that, they certainly won't after this toot 😌

/ht @dompreston.com

12.12.2025 18:36 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Iets over hoofdletters? ;)

16.11.2025 11:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Full Moon Full Moon : Light, Michael: Amazon.nl: Books

Aanrader: www.amazon.nl/Full-Moon-Mi...

03.09.2025 08:27 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
performance.sync() 2025 Β· Luma performance.sync() is a meet-up taking place on the evening before the performance.now on Wednesday October 29th! We are looking for speakers! Submit your…

performance.now() is coming!

The night before the conference, 29th of October, @mozilla.org organises performance.sync(), the pre-meetup where you can meet your peers to mentally prepare for two days of information overload. They're also looking for a few people to present.
luma.com/ziykhh4y

01.09.2025 12:56 πŸ‘ 12 πŸ” 10 πŸ’¬ 1 πŸ“Œ 0
Preview
performance.now(); 30th and 31st of October, Amsterdam On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdamβ€”a single track conference, covering today’s most important web performance insights.

performance.now() is coming!

@adevnadia.bsky.social will provide a deep dive into the new React Server Components. How does the app render in the browser? What are their performance implications? How do they compare to traditional SSR and CSR techniques?

perfnow.nl/speakers.htm...

02.09.2025 11:27 πŸ‘ 4 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
Old Soviet joke for out times:

Guy stops by the newsstand every day, scans the front page, doesn't buy the paper. One day the vendor asks what he's up to.

Guy syas: "looking for an obituary."

Vendor says: "those are towards the back of the paper, comrade."

Guy says: "not the one I'm looking for."

Old Soviet joke for out times: Guy stops by the newsstand every day, scans the front page, doesn't buy the paper. One day the vendor asks what he's up to. Guy syas: "looking for an obituary." Vendor says: "those are towards the back of the paper, comrade." Guy says: "not the one I'm looking for."

30.08.2025 16:34 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
meow you, me, us, irl, reddit style

Not knowing about Greek mythology is my Achilles' horse.
β€” www.reddit.com/r/meirl/comm...

30.03.2025 13:22 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

This leaves a "Content-Disposition: form-data ..." header for each part, which should really be "Content-Disposition: attachment ..." for multipart/mixed, but them's the breaks.

2b/2

25.03.2025 13:22 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

- Replacing "/form-data" in the resulting content type header with "/mixed", crucially retaining the autmatically added (and otherwise opaque) "; boundary=--..." bit;
- Having a lie down πŸ˜…

2/2

25.03.2025 13:20 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

TIL multipart/mixed HTTP requests can be faked in #JavaScript (well, fetch) by:
- Creating a FormData object with an entry named "file";
- Creating a request without a content type header;
- Setting the FormData object as the request body;
- ...

1/2

25.03.2025 13:20 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Other People - Wikipedia

For the benefit of any Americans here: en.wikipedia.org/wiki/Other_P...

04.03.2025 07:50 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Jan van Hellemond :mastodon: (@jvhellemond@mastodon.social) Does currentColor work in #CSS color-mix() functions? Of course it does! πŸŽ‰

Called it! mastodon.social/@jvhellemond...

01.03.2025 13:12 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

#CSS' text-box-trim is a game changer. That is all.

01.03.2025 13:09 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

If there is anything I have learned in all my years, decades even, of writing #JavaScript, it is that undefined is not a function.

27.02.2025 09:34 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I just typed this #JS:

`path.to.object.optionalMethod?.();`

Optionally chaining a function call. Nice, but I need to get used to that syntax πŸ˜…

26.02.2025 09:43 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

*perturbed

26.02.2025 09:42 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Wel een collecte gedaan?

14.02.2025 23:21 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Oh, my fave! Use it almost daily, mostly to squeeze a few more bytes of compression out of icons by removing redundant paths/points, swapping absolute/relative, rounding decimals and scaling.. I'm just listing all the features, aren't I?

14.02.2025 23:21 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
CSS Day 2025, 5th & 6th of June, Amsterdam CSS Day is the conference for CSS designers, developers, spec writers, and browser vendors.

Earlier today #cssday 2025 ticket sales opened. The going is brisk; early birds will likely sell out today.

cssday.nl/tickets.html

11.02.2025 10:53 πŸ‘ 25 πŸ” 19 πŸ’¬ 1 πŸ“Œ 5
Law of the handicap of a head start - Wikipedia

en.wikipedia.org/wiki/Law_of_... 😜

31.01.2025 12:54 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I once did something similar: sniffing for filetype by looking for things like "1f 8b" in the first n bytes. Faster than loading it and trusting mime types or extensions.

It was for a rather snazzy file upload component. Hmm, maybe I'll revive that, I hear there's a market for these things...

31.01.2025 11:27 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Hey gurl, what's your XPathResult.resultType? 😻

31.01.2025 11:20 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

So I follow @joost.blog on here for a bit of drama, but jeez… πŸ˜…

12.01.2025 12:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Could have been worse; could have been a screenshot of Notepad++ pasted into a .docx and shared via WhatsApp #beenthere

08.01.2025 09:51 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

#teamnessa

25.12.2024 22:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
<textarea>: The Textarea element - HTML: HyperText Markup Language | MDN The <textarea> HTML element represents a multi-line plain-text editing control, useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or f...

TIL that pattern validation does not work for <textarea>'s.
β€” developer.mozilla.org/en-US/docs/W...

11.12.2024 14:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0