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Parses srcset and sizes attributes to compute effective widths and densities, then picks the optimal source using a greedy selection strategy.
Distinct from Source Map Resolution: Distinct from Source Map Resolution: resolves image source candidates from srcset/sizes attributes for responsive image selection, not source code mapping for debugging.
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Picturefill is a responsive image polyfill that adds support for the picture element, srcset, and sizes attributes in browsers that lack native implementation. It emulates the picture element with source media queries and format fallbacks, providing responsive image selection based on viewport size and device pixel ratio. The polyfill reevaluates responsive image sources after dynamic DOM changes to keep displayed images correct, and delivers alternative image formats like WebP with automatic fallback to standard formats in unsupported browsers. It also conserves bandwidth by selecting smalle
Parses srcset and sizes attributes to compute effective widths and densities, then picks the optimal source using a greedy selection strategy.