observe-text.html - mozsearch

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /element-timing/observe-text.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Element Timing: observe text</title>

<body>

<style>

body {

  margin: 20px;

p {

  font-size: 12px;

</style>

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

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

<script src="resources/element-timing-helpers.js"></script>

<script>

  async_test((t) => {

    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");

    let paragraph;

    let beforeRender;

    const observer = new PerformanceObserver(

      t.step_func_done((entryList) => {

        assert_equals(entryList.getEntries().length, 1);

        const entry = entryList.getEntries()[0];

        checkTextElement(entry, 'my_text', 'text_id', beforeRender, paragraph);

        assert_equals(entry.intersectionRect.left, 20, 'left should be 20.');

        // Text box size will vary from device to device, so try lower bounding height by 12, width by 100.

        assert_greater_than_equal(entry.intersectionRect.right, 120);

        assert_equals(entry.intersectionRect.top, 20, 'top should be 20.');

        assert_greater_than_equal(entry.intersectionRect.bottom, 32);

})

);

    observer.observe({entryTypes: ['element']});

    // We add the iframe during onload to be sure that the observer is registered

    // in time for it to observe the element timing.

    window.onload = () => {

      paragraph = document.createElement('p');

      paragraph.innerHTML = 'This is text I care about';

      paragraph.setAttribute('elementtiming', 'my_text');

      paragraph.setAttribute('id', 'text_id');

      document.body.appendChild(paragraph);

      beforeRender = performance.now();

};

  }, 'Paragraph with elementtiming attribute is observed.');

</script>

</body>