Cookbook v0.28.0

Minor Changes

• #167 6019743 Thanks @tenphi! - Preview frames that run scripts now fit their content. The frame grows and
  shrinks as the demo's content, the page width, or its fonts change, from its
  minimum height (10rem, or the height prop) up to the browser window's
  height; taller content scrolls inside the frame, as before. The frame keeps its
  opaque origin: a small script in the preview document reports the content's
  height to the page with postMessage. Overlays such as a listbox, a popover,
  or a modal dialog aren't measured, so a new buffer prop adds room below the
  content, such as 15rem for a select's list, and that room follows the content
  as the page width changes. buffer takes a CSS length like height; any other
  value fails the build. Previews without scripts keep their 10rem frame and
  ignore buffer.