// retoor <retoor@molodetz.nl>
import "html" for Document
var doc = Document.parse("<div class='container main'>Content</div>")
var div = doc.querySelector("div")
System.print(div.className) // expect: container main
div.className = "box"
System.print(div.className) // expect: box
var noClass = Document.parse("<span>No Class</span>")
var span = noClass.querySelector("span")
System.print(span.className) // expect:
span.className = "highlight"
System.print(span.className) // expect: highlight
div.className = "one two three"
System.print(div.className) // expect: one two three