observe-008.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /resize-observer/observe-008.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>ResizeObserver test: callback.this</title>

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

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

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

<body>

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

<script>

'use strict';

function test() {

  let harnessTest = async_test("callback.this");

  let resolvePromise;

  let ro = new ResizeObserver( function(entries, obs) {

    let callbackThis = this;

    harnessTest.step(() => {

      assert_equals(callbackThis, ro, "callback.this is ResizeObserver");

      assert_equals(obs, ro, "2nd argument is ResizeObserver");

      ro.disconnect();

      // every reference to RO must be null before test completes

      // to avoid triggering test leak-detection

      ro = null;

      callbackThis = null;

      obs = null;

      harnessTest.step_timeout( _ => {

        harnessTest.done();

        resolvePromise();

      }, 0);

});

);

  let t = createAndAppendElement("div");

  t.style.width = "100px";

  harnessTest.add_cleanup(() => t.remove());

  ro.observe(t);

  return new Promise( (resolve, reject) => {

    resolvePromise = resolve;

});

(async () => await test())();

</script>