Ad
Element subtree: a cross-origin iframe. EasyList ###AdBillboard (un-hideable tier) matches a banner that holds an iframe from test-adblock.org, a different registrable domain (test-owned, on no shipped list), and the label “Ad”. Brave's subtree walk reads the iframe's src as a third-party resource (content_cosmetic.ts:519-527), and two letters are not significant text.
Expected in both modes: hidden, and still hidden on the settled read. Visible means the un-hide treated a third-party iframe as first-party.
Expectations are Brave's verdicts, stated in pages/cosmetic-fixtures.json (ENG-2306); until Brave is measured they are hypotheses. The status line mirrors the Standard expectation.