CrossCall is a lightweight library that enables remote‑procedure‑call‑style communication and event passing between web pages that originate from different domains, using the HTML5 `postMessage` API. It works by embedding a client page in an iframe or popup and exposing async functions on the host, with the library handling the serialization and routing of calls and events across origins. The tool is aimed at developers who need to coordinate cross‑origin interactions—such as widget integration, micro‑frontend communication, or multi‑domain SaaS components—without building custom messaging infrastructure.
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