1. CSS3 Cursors (original values)

    CSS3 cursor values added in the 2004 spec, including none, context-menu, cell, vertical-text, alias, copy, no-drop, not-allowed, nesw-resize, nwse-resize, col-resize, row-resize and all-scroll.

  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 at-rule: `@font-face`: src: drop invalid item (not src string)

  4. css property: backdrop-filter: none

  5. css property: cursor: no-drop

  6. css property: display: none: setting `display: none` on an `<option>` element hides it from the dropdown.

  7. background-filter