Dan Hollick 🇿🇦
product designer - tweets about design systems and tools.
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A year ago
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💡Have you ever wondered why the WCAG colour contrast ratio doesn't always seem to work?💡
Well it actually has to do with how we calculate colour contrast and is super interesting.
Hold on to your butts, this is a 🧵
8 days ago
Why can't you just draw a few black lines on a barcode and spoof the scanner?
Well, the last digit in a barcode is actually there to do some clever error checking.
15 days ago
Ever wondered how a QR code works?
No, me neither but it's low-key fascinating.
(Warning, there is some extremely nerdy shit here.👇 )
22 days ago
Whenever I hit a problem with React its because I don't have a solid understanding of how it really works.
Here's a brief explainer:
2 months ago
SVG viewbox is surprisingly unintuitive but if you visualise it like this it starts to make sense:
3 months ago
Niche tweet, but have you ever been messing around with an icon and wondered how SVG path data works?
It's actually quite simple.
7 months ago
How big is 1px?
Short answer: Almost never the size of a device pixel.
Long answer: It depends how far away it is👇
8 months ago
Color in digital images is almost always completely made up.
This will take a bit of explaining so hear me out. 👇
Gradients are the best way to explain perceptually uniform color spaces
Why do people use Spacer components?
Personally, I prefer using Auto Layout wrappers and controlling spacing with gaps but there might be a use case I'm overlooking?
Made some pros and cons below 👇