getElementsByCss method
Returns the elements within this element that match the given CSS selector.
Implementation
@override
List<PageLoaderElement> getElementsByCss(String selector) =>
_retryWhenStale(() {
final element = _single;
return element
.querySelectorAll(selector)
.map((elem) => HtmlPageLoaderElement.createFromElement(elem,
externalSyncFn: syncFn))
.toList();
});