Comment by username223

This bit from the WebKit response hits hard for me:

> Security Complexity: Proposed security measures (styling constraints, timing, and position mitigation) add substantial complexity, indicating possible fundamental issues with the approach.

"Security complexity" is never something you want to see, because it will become yet another game of whack-a-mole between browser makers and hostile websites (i.e. between Chrome and Google Ads). Does anyone believe that a standard will hold up against the AdTech industry armed with the full power of HTML+CSS+JavaScript? These are the people who brought you the "Enable push notifications? Yes/Pester-me-later" pre-prompt.