Refresh to a javascript: URL should not work

[annevk]

Fixes #11699.

• At least two implementers are interested (and none opposed):
  • Already implemented.
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

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

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/semantics.html ( diff )

[annevk]

I guess we don't need implementation bugs, but it would be good to have test coverage for the Refresh header on WPT first.