1. CSS3 Border images

    Method of using images for borders

  2. Client Hints: DPR, Width, Viewport-Width

    DPR, Width, and Viewport-Width hints enable proactive content negotiation between client and server, enabling automated delivery of optimized assets - e.g. auto-negotiating image DPR resolution.

  3. CSS background-position edge offsets

    Allows CSS background images to be positioned relative to the specified edge using the 3 to 4 value syntax. For example: `background-position: right 5px bottom 5px;` for positioning 5px from the bottom-right corner.

  4. CSS filter() function

    This function filters a CSS input image with a set of filter functions (like blur, grayscale or hue)

  5. CSS image-set

    Method of letting the browser pick the most appropriate CSS image from a given set.

  6. CSS Shapes Level 1

    Allows geometric shapes to be set in CSS to define an area for text to flow around. Includes properties `shape-outside`, `shape-margin` and `shape-image-threshold`

  7. DOMContentLoaded

    JavaScript event that fires when the DOM is loaded, but before all page assets are loaded (CSS, images, etc.).

  8. ImageCapture API

    The Image Capture API provides access to the Video Camera for taking photos while configuring picture-specific settings such as e.g. zoom or auto focus metering area.

  9. Srcset and sizes attributes

    The `srcset` and `sizes` attributes on `img` (or `source`) elements allow authors to define various image resources and "hints" that assist a user agent to determine the most appropriate image source to display (e.g. high-resolution displays, small monitors, etc).

  10. datatransfer api: setdragimage

  11. document api: mozsetimageelement

  12. htmlimageelement api: srcset

  13. htmllinkelement api: imagesrcset

  14. imagecapture api: getphotosettings

  15. imagedecoder api: reset

  16. css property: background-image: `image-set()`

  17. css property: border-image-outset

  18. css property: content: `image-set()`

  19. types: `<image>`: `image-set()`

  20. html element: link: imagesrcset