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Vance Ingalls
5a48321726
applyPositionEdits(doc) guarded each element with `instanceof HTMLElement` — but `doc` is frequently an iframe's document (the SDK's edit preview, any host embedding a composition), whose elements are HTMLElement instances of THAT frame's realm, never this module's. The check silently no-ops on every single element cross-realm, so bulk position edits never apply inside an iframe. Use the document's own realm's HTMLElement constructor (doc.defaultView); duck-type on `.style` when defaultView is unavailable (a detached/synthetic document). The single-element applyPositionEditToElement was already realm-safe — only the bulk wrapper had the bug. Added a regression test using a real jsdom iframe, confirmed it fails on the old `instanceof HTMLElement` check and passes with the fix.