Reading these pages

Nothing is signalled by colour alone. Links are distinguishable without colour, headings are heading elements and not just bigger type, and lists are marked up as lists.

Limits of this page

Where the topic is technical, the wording stays as plain as it can while staying accurate. The remaining difficulty belongs to the subject rather than the page.

Revisions

Any change is made on this page rather than notified separately. The date at the top records when this text was last set.

Questions

Write to [email protected] with any question about anything here that is hard to read.