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A comment on Show HN: AcrossTabs – Easy communication between cross-origin browser tabs. Parent comment

Re:Show HN: AcrossTabs – Easy communication between cross-or... by tyingq on Wednesday April 05, 2017 @08:31AM (#14041581)
It maps back to window.postMessage. There's a security concerns section on Mozilla's docs: https://developer.mozilla.org/en-US/docs/Web/API/Window/post...

All boils down the sender using a specific target, and the receiver remembering to check the origin.

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