Register `Clear-Site-Data`

[mikewest]

Please confirm that:

• [x] You have read and understood the requirements for registration.
• [x] You have checked the registry and found no current value that meets your needs.
• [x] Your specification reference URL is stable; ideally, managed by a widely-recognised standards development organisation (e.g., published as an RFC). Otherwise, please give additional information below.

If so, please provide the details of your request below.

• Field name: Clear-Site-Data
• Status: Permanent
• Specification document(s): https://w3c.github.io/webappsec-clear-site-data/#header
• Comments:

Any additional information (this will not be included in the registry)?

/cc @yoshuawuyts

[mnot]

Do you want to use the GitHub URL or the w3c one? (there was a recent kerfuffle about GitHub URLs in the W3C, IIRC)

[mikewest]

A kerfuffle, you say? Ugh. In that case:

• Field name: Clear-Site-Data
• Status: Permanent
• Specification document(s): https://w3.org/TR/clear-site-data/#header
• Comments:

[mnot]

Great, thanks!