1. CSS Backdrop Filter

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

  2. CSS Filter Effects

    Method of applying filter effects using the `filter` property to elements, matching filters available in SVG. Filter functions include blur, brightness, contrast, drop-shadow, grayscale, hue-rotate, invert, opacity, sepia and saturate.

  3. CSS Initial Letter

    Method of creating an enlarged cap, including a drop or raised cap, in a robust way.

  4. 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.

  5. Drag and Drop

    Method of easily dragging and dropping elements on a page, requiring minimal JavaScript.

  6. datatransfer api: dropeffect

  7. element api: pseudo: `type` parameter: `"::backdrop"` value

  8. eyedropper api

  9. eyedropper api: `eyedropper()` constructor

  10. eyedropper api: open

  11. eyedropper api: secure context required

  12. htmlelement api: `drop` event

  13. observable api: drop

  14. performanceobserver api: `performanceobserver()` constructor: `droppedentriescount()` parameter

  15. svgfedropshadowelement api

  16. svgfedropshadowelement api: dx

  17. svgfedropshadowelement api: dy

  18. svgfedropshadowelement api: height

  19. svgfedropshadowelement api: in1

  20. svgfedropshadowelement api: result

  21. svgfedropshadowelement api: setstddeviation

  22. svgfedropshadowelement api: stddeviationx

  23. svgfedropshadowelement api: stddeviationy

  24. svgfedropshadowelement api: width

  25. svgfedropshadowelement api: x

  26. svgfedropshadowelement api: y

  27. videoplaybackquality api: droppedvideoframes

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

  29. css property: appearance: base-select: base styling for multiple dropdown: `<select multiple size="1">`

  30. css property: appearance: base-select: base styling for single dropdown: `<select>`

  31. css property: backdrop-filter: none

  32. css property: cursor: no-drop

  33. css property: filter: drop-shadow

  34. css selector: `::backdrop`

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

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

  37. css selector: `::backdrop`: backdrop elements inherit their values from its originating element

  38. css selector: `::backdrop`: support on popovers

  39. types: `<filter-function>`: `drop-shadow()`

  40. javascript built-in: iterator: drop

  41. svg element: fedropshadow

  42. svg element: fedropshadow: dx

  43. svg element: fedropshadow: dy

  44. svg element: fedropshadow: in

  45. svg element: fedropshadow: stddeviation

  46. instructions: data.drop

  47. instructions: drop

  48. instructions: elem.drop