sky/tests/custom-elements/registration.sky

<import src="../resources/dump-as-text.sky" />
<script>
import "dart:sky";

class FooElement extends Element {
  final String tagName = "foo";

  attachedCallback() {
    print("PASS: FooElement attached.");
  }

  detachedCallback() {
  }

  attributeChangedCallbackCount(String name, String oldValue, String newValue) {
  }
}

void main() {
  document.registerElement("foo", FooElement);
}
</script>
<foo />
<script>
// This script element creates a microtask checkpoint and ensures that
// the <foo /> attached callback runs before the test ends.
</script>