observer-callback-arguments.html

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/observer-callback-arguments.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>IntersectionObserver: callback arguments</title>

<link rel="help" href="https://w3c.github.io/IntersectionObserver/#notify-intersection-observers-algo">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>

"use strict";

async_test(t => {

  const io = new IntersectionObserver(function(entries, observer) {

    t.step(() => {

      assert_equals(this, io);

      assert_equals(arguments.length, 2);

      assert_true(Array.isArray(entries));

      assert_equals(entries.length, 1);

      assert_true(entries[0] instanceof IntersectionObserverEntry);

      assert_equals(observer, io);

      io.disconnect();

      t.done();

});

});

  io.observe(document.body);

}, "Callback is invoked with |this| value of IntersectionObserver and two arguments");

</script>