I scanned on an iPhone using native QR code scanner and it says "no usable data found".
replies(3):
I created a game inspired by Doom and the backrooms called The Backdooms under 2.4kb in minified html. (for reference, this entire post would be around 1.8kB haha) I had to use a not popular way of using GZip with Zlib headers (had to write my own script for compressing it, also in the repo) to eventually convert it a size 40 QR code that works right in your browser using Decompressionstream API.
This is of course a very oversimplified description of it, using a lot of the same technologies that DOOM had but combining it with infinite seed based map generation in 2.4kb (QR codes can only store 3kb, which includes changing formats) was pretty hard.
Here are some links about it if you want to nerd out and read more:
Repository Link (MIT License): https://github.com/Kuberwastaken/backdooms
A Hosted (slightly improved) version of The Backdooms: https://kuberwastaken.github.io/backdooms/
Game Trailer: https://www.youtube.com/shorts/QWPr10cAuGc
My Linkedin post about it: https://www.linkedin.com/feed/update/urn:li:activity:7295667...
(PS: You'd need something like https://qrscanner.org/ or something that can scan bigger QR codes and put the text data onto your browser to play it)
My Blogs documenting the process and development in detail:
https://kuberwastaken.github.io/blog/Projects/How-I-Managed-... https://kuberwastaken.github.io/blog/Projects/How-I-Managed-...
For example, this self-contained webpage: <html><body>Hi!</body></html>
encoded is: data:text/html;base64,PGh0bWw+PGJvZHk+SGkhPC9ib2R5PjwvaHRtbD4=
If you paste that into a browser, it will render "Hi!". Very short and easy.
But if you encode is as a QR code, it won't work in this situation.
data:text/html,<!doctype html><title>Hi!</title><p>Hello.
Base64 is indeed good to be "safe" and/or somewhat 'conceal' the payload, but it also makes it larger by 1/3 (every three bytes of input become four characters of the base64 output). So taking the risk some devices would not like raw "ASCII dataURI", the QR of the backrooms QR could shave off 738 bytes.
BTW, this is my "HTML sandbox" for testing stuff in a browsers that I summon daily through keyword bookmark to test simple stuff:
data:text/html;charset=utf-8;verbatim,<!doctype html><html style="color-scheme:dark light"><title>HTML sandbox 2.0.6</title><meta name=viewport content=width=device-width,initial-scale=1><body style=margin:0;display:flex;height:100vh onload="OT=(DC=document).title,H=(L=location).hash.slice(1)||'',RX=/(^data:.+?(;verbatim)?,)?([^]*)/,A.value=H.match(RX)[2]?H:decodeURIComponent(H)||A.value;T=W=0;E=RegExp('^'+(D='data:text/html;charset=utf-8,'));F=()=>{if(W!=(V=A.value))W=V,M=V.match(RX),I.src=M[2]?V:(M[1]||D)+encodeURIComponent(M[3]),DC.title=NT=((TM=V.match(/<title\b[^]*?\x3E([^]*?)<\/title\b/m))&&(NT=TM[1])&&(NT=NT.trim())&&(DC.title=NT+' @ '+OT))||OT};F()"><textarea autocapitalize=off style=resize:horizontal;width:50vw autofocus id=A onkeyup=clearTimeout(T);T=setTimeout(F,400) onblur=try{history.pushState({},NT,'\u0023'+(S=I.src.replace(E,'')))}catch(e){L.hash=S}><!doctype html><html lang="en" style="color-scheme: dark light;">%0A<meta name="viewport" content="width=device-width, initial-scale=1">%0A<title>%0A%0A</title>%0A<style>%0A%0A</style>%0A<body>%0A%s%0A<script>%0A%0A</script>%0A</textarea><iframe style=border:0;flex-grow:1;width:0 id=I>