I was experimenting with an object which would use xFenster's callbacks to implement the fence idea and positioning of minimized fensters - but finally I just included that logic in xFenster.
View xFenster Source & Docs.
Demo 1, demo 2, demo 3 and demo 4. The new Property Viewer also uses xFenster. Here is an experimental feature which was not implemented in revision 16.
"These statements of architectural principle explain the thinking behind the specifications. These are personal notes by Tim Berners-Lee: they are not endorsed by W3C. They are aimed at the technical community, to explain reasons, provide a framework to provide consistency for for future developments, and avoid repetition of discussions once resolved."
"The astroid was first discussed by Johann Bernoulli in 1691-92. It also appears in Leibniz's correspondence of 1715. It is sometimes called the tetracuspid for the obvious reason that it has four cusps."
"The astroid only acquired its present name in 1836 in a book published in Vienna. It has been known by various names in the literature, even after 1836, including cubocycloid and paracycle."
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