Chrome makes a scroll container with nothing focusable inside a keyboard stop, and
showModal() gives it the dialog's first focus, which showed the browser's own ring.
The body now takes M3's 3px secondary indicator, inset so the dialog's rounded,
overflow-hidden box does not clip it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
Plan step 23 (containment), containment.md § Missing: "no divider pinned
between a scrolling body and the header/actions". Every dialog now draws a
1px outline-variant rule under the header once the body is scrolled away
from its top, and over the actions while more of it is below; a body that
fits shows neither. The rules are pseudo-elements in the rows' own padding
(dialog.css), so showing one moves nothing, and x-dialog-dividers
(dialog.js) marks the wire:ignore.self <dialog>, which a morph leaves
alone, watching scroll and a ResizeObserver on the body and a wrapper
around the slot. The M3 gaps are split around the rules (8/8 under the
header, 8/16 over the actions). A full-screen dialog's rule sits under its
phone bar, and its action bar's always-on border follows the scroll too.
`separator` now means "draw both rules always" instead of rendering two
<x-divider> elements. The fade uses the effects-fast token, zero under
reduced motion.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
