1 No. HTML-based formatting was deprecated in 1997, when HTML 4 was adopted. Industry best practices recommend using CSS-based formatting instead.
2 CSS imposes an imaginary box on each element. This box, and its content, can then be styled with borders, background colors and images, margins, padding, and other types of formatting.
3 False. Even if you do nothing, many HTML elements feature default formatting.
4 The four theories that affect CSS formatting are cascade, inheritance, descendant, and specificity.
5 False. Many CSS3 features are already supported by modern browsers and can be used right now.