Finds the first descendant element of this document fragment that matches the specified group of selectors.
selectors
should be a string using CSS selector syntax.
var element1 = fragment.querySelector('.className'); var element2 = fragment.querySelector('#id');
For details about CSS selector syntax, see the CSS selector specification.
Element querySelector(String selectors) native;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/DocumentFragment/querySelector.html