Issue #3554239 by jessebaker: Slots that have no markup in the in intial HTML document payload are not represented in the Overlay UI (!257) · Merge requests · project / canvas

Introduce a mutation observer each time the iframe element changes to watch for subsequent changes to the iFrame DOM and update the various maps used by the overlays.

Closes #3554239

Issue #3554239 by jessebaker: Slots that have no markup in the in intial HTML document payload are not represented in the Overlay UI

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