Add new strings for notRestoredReason

[lozy219]

• At least two implementers are interested (and none opposed):
  • Chromium
  • …
• Tests are written and can be reviewed and commented upon at:
  • this only updates the text for some BFCache not restore reasons and it's not covered in the tests.
• Implementation bugs are filed:
  • Chromium: https://issues.chromium.org/issues/40267647
  • Gecko: …
  • WebKit: …
• Corresponding HTML AAM & ARIA in HTML issues & PRs:
• MDN issue is filed: …
• The top of this comment includes a clear commit message to use.

As part of the project that enables pages with Cache-control: not store header, we will evict the BFCache-eligible page if it has ever used WebSocket, WebRTC and WebTransport. These are implemented, but the not restore reason string was not specified. Currently Chromium shares the string with the ones used for active WebSocket/WebRTC/WebTransport, but it could be confusing. We are proposing to create 3 new strings for the reason introduced by the CCNS changes.

see https://github.com/fergald/explainer-bfcache-ccns/blob/main/README.md for more information.

(See WHATWG Working Mode: Changes for more details.)

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/nav-history-apis.html ( diff )

[lozy219]

@domenic @smaug---- could you help to review this change? This is an addition to #9360

[domenic]

LGTM!