Cookbook v0.27.0

Minor Changes

• #165 4647fe2 Thanks @tenphi! - Add a height prop to Preview for demos that need more room, such as a
  listbox, a popover, or a modal dialog. It sets the frame's minimum height to a
  CSS length, such as 18rem, in place of the default 10rem; any other value
  fails the build. Forms in previews can now be submitted: the frame's sandbox
  includes allow-forms, so a submit listener can call event.preventDefault()
  and show the form's data. The frame keeps its opaque origin, and a submission
  can navigate only the frame, never the documentation page.