The test verifies functionality of protocol method CSS.setStyleTexts and DOM.undo.
==== Initial style sheet text ====
#test { color: green; }
==== Style sheet text ====
#test {color: blue;}
Dumping matched rules:
*#test* { regular
color: blue; @[1:7-1:19]
color: blue; @[undefined-undefined]
}
Dumping inherited rules:
==== Style sheet text after clearing the stylesheet and DOM.Undo ====
<empty>