What new CSS3 selector would you use to style any h2 element that happened to be the fifth child of its parent? What is the purpose of the text that should always be present in the body of an HTML5...

What new CSS3 selector would you use to style any h2 element that happened to be the fifth child of its parent? What is the purpose of the text that should always be present in the body of an HTML5 video element? What deprecated HTML tag did we introduce in this chapter, just to make a point, and what was the point?