1. Dialog element

    Method of easily creating custom dialog boxes to display to the user with modal or non-modal options. Also includes a `::backdrop` pseudo-element for behind the element.

  2. htmldialogelement api

  3. htmldialogelement api: `cancel` event

  4. htmldialogelement api: close

  5. htmldialogelement api: closedby

  6. htmldialogelement api: `close` event

  7. htmldialogelement api: open

  8. htmldialogelement api: requestclose

  9. htmldialogelement api: returnvalue

  10. htmldialogelement api: show

  11. htmldialogelement api: showmodal