[danShumway]

The problem isn't that the hack only works in Chrome, it's that the system being proposed is inherently terrible regardless of how it's implemented.

There is no such thing as a reliable standard for browsers to verify that users are human that does not harm the open web or threaten user autonomy and accessibility. Every single accessibility standard and user choice about extensions and access is abusable by malicious actors, and every security measure to block abuse of automated scraping or access also blocks valid use cases.

Making it a web standard won't change that fact.