Plan step 36. <x-tooltip> renders data-md-tooltip and data-md-side on the bubble and data-md-tooltip-anchor on a standalone trigger's wrapper; tooltip.css draws PlainTooltipTokens' inverse-surface bubble, its anchor placement and flips per side, and the fade on the fast effects spring with @starting-style. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9