image-TAO.sub.html

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/image-TAO.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Largest Contentful Paint: observe cross origin images with various Timing-Allow-Origin headers</title>

<body>

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

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

<script src="resources/largest-contentful-paint-helpers.js"></script>

<div id='my_div'></div>

<script>

  setup({"hide_test_state": true});

  async_test(t => {

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

    const remote_img = 'http://{{domains[www]}}:{{ports[http][1]}}/element-timing/resources/TAOImage.py?'

        + 'origin=' + window.location.origin +'&tao=';

    const valid_tao = ['wildcard', 'origin', 'multi', 'multi_wildcard', 'match_origin', 'match_wildcard'];

    const invalid_tao = ['null', 'space', 'uppercase'];

    const div = document.getElementById('my_div');

    let img_length = 20;

    function addImage(tao) {

      const img = document.createElement('img');

      img.src = remote_img + tao;

      img.id = tao;

      // Set increasing size so that largest-contentful-paint captures all of them.

      img_length++;

      img.height = img_length;

      img.width = img_length;

      div.appendChild(img);

    let img_count = 0;

    const total_images = valid_tao.length + invalid_tao.length;

    let beforeLoad;

    new PerformanceObserver(

      t.step_func(entryList => {

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

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

        const tao = entry.id;

        const url = remote_img + tao;

        const size = img_length * img_length;

        let options = valid_tao.includes(tao) ? [] : ['renderTimeIs0'];

        checkImage(entry, url, tao, size, beforeLoad, options);

        img_count++;

        beforeLoad = performance.now();

        // Process valid TAO images first.

        if (img_count < valid_tao.length)

          addImage(valid_tao[img_count]);

        // Then add invalid TAO images.

        else if (img_count < total_images)

          addImage(invalid_tao[img_count - valid_tao.length]);

        // Once we've seen all the images, end the test.

        else

          t.done();

})

    ).observe({type: 'largest-contentful-paint'});

    // Add first image, the rest will be added on each observer callback.

    addImage(valid_tao[0]);

    beforeLoad = performance.now();

  }, 'Cross-origin elements with valid TAO have correct renderTime, with invalid TAO have renderTime set to 0.');

</script>

</body>