> It's worth noticing that even the preload directive is non-standard, even though it's used as part of this entire "preload infrastructure" all across the web.

> It's worth noticing that even the preload directive is non-standard, even though it's used as part of this entire "preload infrastructure" all across the web. This isn't exactly accurate. The HSTS RFC explicitly contemplates the preload list: https://www.rfc-editor.org/rfc/rfc6797#section-12.3 https://www.rfc-editor.org/rfc/rfc6797#section-12.3