sizes-dynamic-001.html

mozilla-central/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/sizes-dynamic-001.html

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Test Info:

This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/sizes/sizes-dynamic-001.html - WPT Dashboard Interop Dashboard

<!doctype html>

<html class="reftest-wait">

<title>Image intrinsic size specified via sizes attribute reacts properly to media changes</title>

<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

<link rel="match" href="sizes-dynamic-001-ref.html">

<link rel="help" href="https://html.spec.whatwg.org/#sizes-attributes">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1149357">

<script>

function frameLoaded(frame) {

  frame.width = "500";

  let img = frame.contentDocument.querySelector('img');

  // Trigger the viewport resize, which will trigger the image load task.

  img.offsetWidth;

  // Wait for the image load task to run.

  setTimeout(() => document.documentElement.removeAttribute("class"), 0);

</script>

<iframe onload="frameLoaded(this)" width="200" height="500" srcdoc='<!doctype html><img srcset="/images/green-256x256.png 100w" style="max-width: 100%" sizes="(min-width: 400px) 10px, 20px">'></iframe>