fullscreen/rendering/backdrop-object.html

<!DOCTYPE html>
<html class=reftest-wait>
<title>::backdrop for a fullscreen object element</title>
<link rel=match href="backdrop-object-ref.html">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/6939">
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<style>
object::backdrop {
  background: blue;
}
</style>
<object width="200" type="image/svg+xml"></object>

<script>
const object = document.querySelector("object");

Promise.all([
  new Promise((resolve) => {
    object.addEventListener("load", resolve);
    object.data = "/images/100px-green-rect.svg";
  }),
  new Promise((resolve) => {
    document.addEventListener("fullscreenchange", resolve);
    test_driver.bless('fullscreen', () => object.requestFullscreen());
  }),
]).then(() => document.documentElement.classList.remove('reftest-wait'));
</script>