<x-textarea> marks its field root data-md-textarea, and what a <textarea> changes in the field — the grip in the corner, the label on the first line, autogrow between rows and max-rows, the filled offsets — moves from field.css to components/textarea.css (plan step 36). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9