incumbent.sub.html

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<!DOCTYPE html>

<title>Incumbent page used as a test helper</title>

<iframe src="relevant.html" id="r"></iframe>

<script>

"use strict";

const relevant = document.querySelector("#r").contentWindow;

window.setupWebSocket = (binaryType, fn) => {

    const wsocket = new relevant.WebSocket("ws://{{host}}:{{ports[ws][0]}}/echo");

    wsocket.addEventListener("open", () => {

        wsocket.binaryType = binaryType;

        wsocket.send(new ArrayBuffer(15));

});

    wsocket.addEventListener("message", ev => {

        fn(relevant, ev);

});

};

</script>