css/cssom-view/resizeTo-negative.html

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-window-resizeto">
<link rel="help" href="https://github.com/servo/servo/pull/39204">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/rendering-utils.js"></script>
<script>
"use strict";
promise_test(async t => {
  const w = window.open("/css/reference/blank.html", "", "width=600,height=450");
  assert_not_equals(w, null, "Popup isn't null");
  t.add_cleanup(() => w.close());

  // Try as early as possible, when probably we only have about:blank.
  w.resizeTo(-1, -1);

  // Try again after load, some browser might ignore the former one.
  if (w.location.href === "about:blank" || w.document.readyState !== "complete") {
    await new Promise(resolve => w.addEventListener("load", resolve, {once: true}));
    w.resizeTo(-1, -1);
  }

  // Wait a bit, so that the resize can finish. Note that listening for a "resize"
  // event would result in a timeout if no resize occurred.
  await waitForAtLeastOneFrame();
  await waitForAtLeastOneFrame();

  assert_greater_than(w.outerWidth, 0, "Popup width is positive");
  assert_greater_than(w.outerHeight, 0, "Popup height is positive");
}, "resizeTo(-1, -1) might shrink window size, but it stays positive");
</script>