Finds the first descendant element of this document that matches the specified group of selectors.
Unless your webpage contains multiple documents, the top-level querySelector method behaves the same as this method, so you should use it instead to save typing a few characters.
selectors
should be a string using CSS selector syntax.
var element1 = document.querySelector('.className'); var element2 = document.querySelector('#id');
For details about CSS selector syntax, see the CSS selector specification.
Element querySelector(String selectors) => document.querySelector(selectors);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-html/querySelector.html