1. DomName('Element.querySelector')
  2. DocsEditable()
Element querySelector(String selectors)

Finds the first descendant element of this element that matches the specified group of selectors.

selectors should be a string using CSS selector syntax.

// Gets the first descendant with the class 'classname'
var element = element.querySelector('.className');
// Gets the element with id 'id'
var element = element.querySelector('#id');
// Gets the first descendant [ImageElement]
var img = element.querySelector('img');

For details about CSS selector syntax, see the CSS selector specification.

Source 

@DomName('Element.querySelector')
@DocsEditable()
Element querySelector(String selectors) => _blink.BlinkElement.instance.querySelector_Callback_1_(this, selectors);