The homework says:
- Turn the second paragraph into a block-level quote, and semantically indicate that the quote is taken from Accessibility.
- Semantically mark up “HTML” and “CSS” as acronyms, providing expansions as tooltips.
- Semantically associate machine-readable dates with the dates in the text.
- Use subscript and superscript to provide correct semantics for the chemical formulae and dates, and make them display correctly.