Portal rendering
<Frame> and useIframe render React children into an iframe, and mount only after
the iframe’s own document has loaded, not into the temporary about:blank before it.
react-iframe-kit
Render into iframes, size them to their content, and talk to them with typed calls and events. One package, one connection per iframe.
Auto-resize
useIframeResize follows the content’s size, same-origin or cross-origin, with a guard
against content that grows with the iframe forever.
Typed RPC and events
Describe each side once with Side<>, then call methods and emit events in both
directions. Calls made before the handshake is complete are queued.
Safe by default
Origins are checked on both sides, and the child must list the parents it accepts.
'*' needs an explicit unsafeAllowAnyOrigin.