Detailed element documentation on hover

Detailed element documentation on hover

Hovering a `` tag now shows detailed information about an element’s API — some documentation, its bindings, which bindings are required, and so on.

• A real description. Elements and individual bindings can carry Markdown documentation (a role summary up top, a note per binding), rendered inline — so the hover explains what a binding is for, not just its name.
• Binding direction and type. Each binding shows whether the element reads it (a grey ↓ “pull”), writes it back (an orange ↑ “push”), or both (a red ↔ two-way), along with the accepted Java type. When a binding reads one type and writes another — like a checkbox that reads any value by truthiness but writes back a Boolean — the two are shown separately.
• Status badges. Container elements and binding-passthrough elements are flagged with a badge in the header, and a small marker shows whether the documentation came from a project’s own definition or a richer bundled one.
• Read it comfortably. The popup opens at a generous size, scrolls when an element has a lot of bindings, and stays open when you move into it so you can select and copy text.

This richer documentation is driven by an experimental .apiext format. The editor uses it when a parsable definition is available (today for a small set of built-in elements and for AjaxSlim’s components) and falls back to the classic definition otherwise — so existing projects keep working unchanged while the format settles.

From the changelog, June 23, 2026.