Referrer-Policy - Update for "Safari on iOS", Safari and IE (#14675)

[debiru]

Summary

Update for "Safari on iOS", Safari and IE.
The "notes" in IE is reprinted from https://caniuse.com/referrer-policy

Test results and supporting details

see #14675

Related issues

Fixes #14675

[debiru]

@ddbeck If you don't mind, I'd appreciate it if you could take a look. It would be great if you could merge it or comment.

[ddbeck]

Hi and thank you for this PR. I see it's your first to the project—welcome!

I think the IE details may be misplaced. See the line comment for more detail

[debiru]

Thank you for reviewing. I overlooked that https://developer.mozilla.org/ja/docs/Web/HTML/Element/meta was there.

There seems to be no information about referrers other than IE, so I'll investigate that while I'm at it.

[debiru]

I have checked on the corresponding versions of each.

• for HTTP/Headers/Referrer-Policy
  • the test page is https://rp1.lavoscore.org/path/to/0_NULL.php
• for HTML/Element/meta name.referrer
  • the test page is https://rp3.lavoscore.org/path/to/0_NULL.php

And I also referred to https://caniuse.com/referrer-policy

I could not test Opera Android because I do not have the environment to test it.

[ddbeck]

Looks good. Thank you! 🎉