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Michaël Vanderheyden

@th3s4mur41.me

94 followers 191 following 330 posts

Lead UX Engineer & Accessibility Specialist @ cycos, an Atos Business #CPWA #WebDev #A11y #CSS Martial arts lover | Shotokan Karate black belt | BJJ practitioner | Bikejöring th3s4mur41.me

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Michaël Vanderheyden @th3s4mur41.me · 12/08/2026

I found a weird (specificity) bug in the current mixin implementation in Chrome/Edge. @patrickbrosset.com Applying the mixin before the generic selector doesn't work, but it does if the mixin is applied after codepen.io/editor/th3s4...

Two paragraphs of lorem ipsum on a grey background. The second paragraph has a dotted deep pink border.

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Michaël Vanderheyden @th3s4mur41.me · 09/07/2026

My colleague Julia Undeutsch built "Div & Die": a game where players must guide a blind pedestrian across a street. Because the map uses only generic <div> tags, screen readers can't detect the tactile guidelines or white cane cues. A perfect look at why semantic code is vital!

Screenshot of 'Div & Die', a 2D game testing semantic HTML. The left side shows a top-down view of a pedestrian with a white cane attempting to cross a busy street via tactile paving. The right side shows the game's code panel filled entirely with non-semantic nested div tags instead of structural HTML landmarks. Text instructions warn that without semantic elements, a screen reader cannot intercept the environmental cues or landmarks needed to cross safely.

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Michaël Vanderheyden @th3s4mur41.me · 03/07/2026

Ready to crush the Aachener Firmenlauf! 🏃‍♂️ The energy at the starting line is amazing. Let’s see what these legs can do. If you’re here, give a wave! 👊

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Michaël Vanderheyden @th3s4mur41.me · 27/05/2026

No, it's brid.gy/bluesky/start The login basically works but after a few minutes (probably due to polling or crawling), I'm disconnected again.

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Michaël Vanderheyden @th3s4mur41.me · 13/03/2026

Not too shabby... The screen makes a big difference though, my best score was on my aging Surface Pro 7+.

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Michaël Vanderheyden @th3s4mur41.me · 20/01/2026

The CodePen preview is crashing in both examples for me in Chrome 146.0.7643.0 (Official Build) canary (64-bit). It's working fine after updating to Chrome 146.0.7644.0 (Official Build) canary (64-bit)

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Michaël Vanderheyden @th3s4mur41.me · 27/11/2025

cycos Christmas bash 🎄 came with custom mugs for everyone. Mine? Sensei of A11y & Samurai of CSS 🥋☕ Perfect fit for my passion + Th3S4mur41.me. Big thanks to Lars Hermanns for the creative titles & hand‑wrapped gifts! #TeamCycos #Atos #A11y #CSS #WebDev #ChristmasSpirit #Th3S4mur41 #TeamSpirit

White ceramic mug with black interior, printed with a red ribbon banner showing the name 'Michaël,' five yellow stars, and the text 'Sensei of A11y & Samurai of CSS

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Michaël Vanderheyden @th3s4mur41.me · 24/10/2025

Just found a bug in @developer.chrome.com subgrid doesn't work in fieldset... github.com/webcompat/we... What makes it worse, is that #DevTools don't display the grid lines in fieldset at all 😦 #WebCompat #subgrid #fieldset #bug

Demo of the bug showing Firefox on the left and Edge on the right.
In Firefox both examples (grid and subgrid) are almost aligned. In Edge the subgrid version is broken and DevTools grid lines are missing

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Michaël Vanderheyden @th3s4mur41.me · 22/09/2025

Ran the Aachener Firmenlauf with my Cycos crew last Friday—sunny skies, great vibes, and a new personal best: 5:18"/km 🎉 Big thanks to everyone who ran or cheered. Already looking forward to the next one! #TeamCycos #TeamAtos #AachenerFirmenlauf #12AFL #AFL #Aachen #KeepImproving

Michael running in a group of people during the Aachener Firmenlauf 2025 wearing an Atos T-shirt

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Michaël Vanderheyden @th3s4mur41.me · 08/09/2025

I'm currently facing an issue with Subgrid and SVG in Firefox where the svg is overflowing out of the grid when inline-size is set to 75% and block-size is auto. @jakearchibald.com any chance you could have a quick look at this one? github.com/webcompat/we...

On the left (Chromium), the SVGs are placed on top of the text within the subgrid as expected. On the Right (Firefox), the SVGs are overflowing out of the grid and behind the text

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Michaël Vanderheyden @th3s4mur41.me · 05/06/2025

Wish I could have been there in person for @cssday.nl conference this year, but grateful for the chance to catch all the great talks via the Conffab live stream! Excited to learn and soak up all the insights from afar. So let's start with @nerdy.dev's scroll UX #CSSDay #WebDev

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