querySelectorAll method
ElementList<Element> querySelectorAll(Finds all descendant elements of this document that match the specified group of selectors.
Unless your webpage contains multiple documents, the top-level querySelectorAll 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 items = document.querySelectorAll('.itemClassName');
For details about CSS selector syntax, see the CSS selector specification.
Source
ElementList<Element/*=T*/ > querySelectorAll/*<T extends Element>*/( String selectors) => new _FrozenElementList/*<T>*/ ._wrap(_querySelectorAll(selectors));
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/Document/querySelectorAll.html