[w3c/permissions] Add a note about masked returned permission states (PR #477)

This PR adds a note about the possibility of user agents masking the queried permission states, which reflects what WebKit currently does according to https://github.com/mdn/browser-compat-data/issues/25032.


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<a href="https://pr-preview.s3.amazonaws.com/antosart/w3c-permissions/pull/477.html" title="Last updated on Jun 18, 2026, 6:41 AM UTC (4b7ddfb)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/477/0051a83...antosart:4b7ddfb.html" title="Last updated on Jun 18, 2026, 6:41 AM UTC (4b7ddfb)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/477

-- Commit Summary --

  * Add a note about masked returned permission states

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/permissions/pull/477.patch
https://github.com/w3c/permissions/pull/477.diff

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