1. 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).

  2. htmlimageelement api: srcset

  3. htmllinkelement api: imagesrcset

  4. htmlsourceelement api: srcset

  5. html element: link: imagesrcset

  6. html element: source: srcset