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. htmlsourceelement api: src

  3. htmlsourceelement api: srcset

  4. html element: source: src

  5. html element: source: srcset

  6. headers http header: content-security-policy: script-src: `inline-speculation-rules` source expression

  7. headers http header: content-security-policy: script-src: source expression allowing webassembly execution