avoid-reload-on-resize.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Avoid srcset image reloads when viewport resizes</title>

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

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

<script>

setup({single_test:true});

const image_was_loaded = () => {

  const iframe = document.getElementById("iframe");

  // Resize the iframe

  iframe.width="400";

  // Wait 500 ms

  step_timeout(() => {

    // Check that the iframe only loaded a single resource

    const entries = iframe.contentWindow.performance.getEntriesByType("resource");

    assert_equals(entries.length, 1);

    done();

  }, 500);

</script>

<iframe id=iframe width="401" src="resources/resized.html" onload="image_was_loaded()"></iframe>