* fix(posting-guard): distinguish transparent text from decorations
* fix(posting-guard): anchor all hidden-style property names
* test(posting-guard): clarify browser style calibration cases
* docs(changelog): reference posting style fix PR 717
* fix(posting-guard): keep off-screen margins hidden once property names are anchored
The unanchored pattern caught margin-left/margin-top: -9999px only as a suffix of
left/top. Anchoring the names would have lost that, so list the margin forms
explicitly and pin them with a test.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Co-authored-by: Mads Lorentzen <madslorentzen17@gmail.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>