fath0m

why not just use

  <form action="https://example.com"><button type="submit">Link button</button></form>

no need for JS

Using all the browser functionality feels like cheating. There is a good YouTube video, where a person made a snake game that fits inside a QR Code (albeit a larger version that we're used to, which can hold up to 2953 bytes). You can check it out here: https://www.youtube.com/watch?v=ExwqNreocpg

Quite an interesting watch.