1. CSS Backdrop Filter

    Method of applying filter effects (like blur, grayscale or hue) to content/elements below the target element.

  2. 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.

  3. css selector: `::backdrop`

  4. css selector: `::backdrop`: support on `dialog` elements

  5. css selector: `::backdrop`: fullscreen support

  6. background-filter