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).
htmlsourceelement api: src
htmlsourceelement api: srcset
html element: source: src
html element: source: srcset
headers http header: content-security-policy: script-src: `inline-speculation-rules` source expression
headers http header: content-security-policy: script-src: source expression allowing webassembly execution
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