Content - 0645ea7ef5f8920bbb03e8024509026d5e303bf5 - 7a5d857/workers/postMessage_ports_readonly_array.htm

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Tip revision: 52900e8f91575e90ed01bfeacaf8f2ad7c55529d authored by James Graham on 21 March 2018, 15:54:47 UTC
commit f712edbaad27ef27fde23681673a8e7b2e4b8534

Tip revision: 52900e8

postMessage_ports_readonly_array.htm

<!DOCTYPE html>
<title> postMessage(): read-only ports array </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
"use strict";
async_test(function(t) {
  var channel = new MessageChannel();
  var targetPort = channel.port2;
  targetPort.start();
  targetPort.addEventListener("message", t.step_func_done(function(e) {
    var channel3 = new MessageChannel();
    assert_throws(new TypeError(), () => {
      e.ports.push(channel3.port1);
    }, "ports is a frozen object");
    assert_equals(e.ports.length, 1, "ports is a read only array with length == 1.");
  }), true);
  var channel2 = new MessageChannel();
  channel.port1.postMessage("ports", [channel2.port1]);
});
</script>

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