1 files changed, 24 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-remove-source.html b/testing/web-platform/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-remove-source.html
new file mode 100644
index 0000000000..fbeead0191
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-remove-source.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>Changes to networkState when inserting and removing a &lt;source></title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+var v;
+var t = async_test(function(t) {
+  v = document.createElement('video');
+  assert_equals(v.networkState, v.NETWORK_EMPTY, 'networkState when creating the element');
+  v.appendChild(document.createElement('source')); // runs resource selection algorithm
+  assert_equals(v.networkState, v.NETWORK_NO_SOURCE, 'networkState when inserting a source element');
+  v.removeChild(v.firstChild);
+  assert_equals(v.networkState, v.NETWORK_NO_SOURCE, 'networkState after removing the source element');
+});
+</script>
+<!-- now resource selection will continue its sync section (the </script> tag below provides a stable state) -->
+<!-- will find neither src nor source, so sets networkState to NETWORK_EMPTY -->
+<script>
+t.step(function() {
+  assert_equals(v.networkState, v.NETWORK_EMPTY, 'networkState after letting the sync section of resource selection run');
+  t.done();
+});
+</script>