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Earlier quoted context omitted.
Did you read the explanation? It says right there on the page why it happens. Or was that text added since you viewed it?
I probably didn’t read it. But I also had to read it twice to understand what it meant. I’m still not sure if this is the mentioned issue or a different one.
Unfortunately the most important thing here is missing - the whole explanation, like how did we get there, what those fonts can do and so on..
OpenType specification is Turing complete, its hinting engine does math during rasterization and its GSUB (Glyph Substitution, a layout and shaping engine) does glyph stacking, QR code correction, etc to finalize the QR. The nice thing about it is if you copy and paste it, it goes to the original text.
Unfortunately the most important thing here is missing - the whole explanation, like how did we get there, what those fonts can do and so on..
OpenType specification is Turing complete, its hinting engine does math during rasterization and its GSUB (Glyph Substitution, a layout and shaping engine) does glyph stacking, QR code correction, etc to finalize the QR. The nice thing about it is if you copy and paste it, it goes to the original text.
It doesn’t seem to like spaces that much, the code for [QR coded] is broken for me on safari ios. When the space is removed it’s a working qrcode again
Impressive, but on iOS 27 even one of the examples don't work. Seems like it has an issue with spaces. https://imgur.com/a/tZGqtjR
This ... means the page could render a QR code for humans while letting bots see the actual URL. That is incredibly cool.
This could be used for good (diverting bots away from where you don't want them) or evil (different destinations for user and other readers of the page could be used to trick people going to undesirable locations, because the apparent URL checks out find according to automated scanners).
Font rendering should scare you
This ... means the page could render a QR code for humans while letting bots see the actual URL. That is incredibly cool.