The tooltip design pattern is at:
https://w3c.github.io/aria-practices/#tooltip

It is largely complete. Things to fix include:

• Redundant wording and incomplete sentences in the description.
• The keyboard section needs revisions to bring it inline with APG editorial requirements.
• The states and properties section needs revisions to bring it inline with APG editorial requirements.
• Remove external links from example section.
  page.

Open questions:

• Should there be any guidance about using tooltip verses title attribute.
• The introduction links to the non-modal dialog section. Should that instead be to the tooltip dialog pattern called for by issue Draft tooltip dialog design pattern #85?