 let parentElement = getParentElement();

  test(() => {
    let element = define_build_in_custom_element(
      [contentAttributeName], interfaceName, elementName
    );
    let instance = document.createElement(elementName, { is: element.name });

    assert_array_equals(element.takeLog().types(), ['constructed']);
    // source element as a child of a picture element, before the img element
    parentElement.prepend(instance);
    assert_array_equals(element.takeLog().types(), ['connected']);
    instanc