querySelectorAll method Null safety

List<Element> querySelectorAll(
  1. String selector

Returns all descendant nodes matching the given selectors, using a preorder traversal.

NOTE: Not all selectors from selectors level 4 are implemented. For example, nth-child does not implement An+B syntax and *-of-type is not implemented. If a selector is not implemented this method will throw UnimplementedError.


List<Element> querySelectorAll(String selector) =>
    query.querySelectorAll(this, selector);