// retoor <retoor@molodetz.nl>
import "html" for Document
var doc = Document.parse("<ul><li>A</li><li>B</li><li>C</li><li>D</li><li>E</li></ul>")
System.print(doc.querySelector("li:nth-child(1)") != null) // expect: true
System.print(doc.querySelector("li:nth-child(1)").textContent) // expect: A
System.print(doc.querySelector("li:nth-child(3)") != null) // expect: true
System.print(doc.querySelector("li:nth-child(3)").textContent) // expect: C
System.print(doc.querySelector("li:nth-child(5)") != null) // expect: true
System.print(doc.querySelector("li:nth-child(5)").textContent) // expect: E
System.print(doc.querySelector("li:nth-child(6)") == null) // expect: true