popover

• HTML attributes
  • popover - auto|manual - 表示该元素为 popover - 在 顶层显示
    • HTMLElement.popover
  • popovertarget
    • {HTMLButtonElement,HTMLInputElemen}.popoverTargetElement
  • popovertargetaction - hide|show|toggle
    • {HTMLButtonElement.popoverTargetAction,HTMLInputElement}.popoverTargetAction
• CSS
  • ::backdrop
  • :popover-open
• ToggleEvent
  • beforetoggle
  • toggle
• HTMLElement.hidePopover()
  • display: none
• HTMLElement.showPopover()
• HTMLElement.togglePopover()

<button popovertarget="mypopover">Toggle the popover</button>
<div id="mypopover" popover>Popover content</div>