Good old footnotes are undervalued in webpages. Even serious commentary and longer articles and reports often use mediocre tooltips made with the title attribute as a poor substitute. Footnotes are much more usable and accessible. 1. Why the title attribute is 99% bad 2. Why footnotes are so much better 3. Well-documented linking 4. A footnote is a footnote 5. Sidebars made with JavaScript 6.