<body> element would not trigger destructor functions in the old <body>.[up-layer] attributes or { layer } options were ignored.[up-target] and form[up-target] get a new modifying attribute [up-fail-layer].
Use it to set the layer to update if the server sends a non-200 status code. Valid values are auto, page, modal and popup.up.replace() or up.submit() now have a { failLayer } option.
If you're upgrading from an older Unpoly version you should load unpoly-migrate.js
to polyfill deprecated APIs.
Changes handled by unpoly-migrate.js are not considered breaking changes.
See our upgrading guide for details.