// retoor <retoor@molodetz.nl>
import "html" for Document
var doc = Document.parse("<div id='first'><p id='second'>Text</p></div>")
System.print(doc.querySelector("#first") != null) // expect: true
System.print(doc.querySelector("#first").tagName) // expect: DIV
System.print(doc.querySelector("#second") != null) // expect: true
System.print(doc.querySelector("#second").tagName) // expect: P
System.print(doc.querySelector("#nonexistent") == null) // expect: true
System.print(doc.querySelector("div#first") != null) // expect: true
System.print(doc.querySelector("p#second") != null) // expect: true
System.print(doc.querySelector("span#first") == null) // expect: true