scottjehl/picturefillArchived

Features

• Picture Element Polyfills - Replaces the native picture element with a script-driven equivalent that coordinates source selection across media, type, and density axes.
• Srcset Polyfills - Provides responsive image selection based on viewport size and device pixel ratio via srcset and sizes.
• Media Query Image Switchers - Switches image sources at defined layout breakpoints using the picture element with source elements and media attributes.
• Srcset Resolution Algorithms - Parses srcset and sizes attributes to compute effective widths and densities, then picks the optimal source using a greedy selection strategy.
• WebP Fallback Polyfills - Delivers WebP images with automatic fallback to standard formats in unsupported browsers.
• Media Query Image Switchers - Switches image sources at defined layout breakpoints using the picture element with source elements and media attributes.
• Image Format - Iterates through type-specified source elements to fall back to the next supported image format when the current one is not renderable.
• Responsive Image Polyfills - Adds support for the picture element, srcset, and sizes attributes in browsers that lack native implementation.
• Viewport-Adaptive Image Selectors - Selects the most appropriate image source based on the browser's viewport dimensions and the image's layout size.
• Viewport-Based Asset Switching - Selects the most appropriate image source based on browser viewport dimensions and layout size.
• DOM Mutation Responsive Image Reevaluators - Reevaluates responsive image sources after dynamic DOM changes to keep displayed images correct.
• Polyfill Injection Scripts - Injects a JavaScript polyfill that intercepts image element parsing to apply responsive image selection at runtime.
• Responsive Image - Adds support for the picture element, srcset, and sizes attributes in browsers that lack native implementation.
• Responsive Image Loaders - Loads the most appropriate image source based on viewport size and device capabilities using the picture element and srcset or sizes attributes.
• Media Query Polyfills - Evaluates CSS media queries and pixel density descriptors against the current viewport to select the best image source candidate.
• Modern Image Format Support - Delivers alternative image formats like WebP or SVG to browsers that support them, with fallback sources for others.
• Runtime Format Negotiation - Delivers alternative image formats like WebP or SVG to browsers that support them, with fallback sources for others.
• High-Resolution Image Delivery - Delivers higher-resolution image variants to devices with high pixel density displays while respecting bandwidth constraints.
• Resolution-Based Image Servers - Delivers higher-resolution image sources to high-density displays while serving standard-resolution sources to others.
• Density-Aware Bandwidth Optimization - Prefers lower-resolution image sources on very high-density displays to reduce data transfer when visual differences are negligible.
• DOM Change Responsive Image Reevaluators - Triggers a fresh evaluation of responsive image elements after dynamic DOM updates to ensure the correct source displays.
• DOM Mutation Observation - Watches for dynamically added image elements and re-runs polyfill logic to ensure responsive sources are applied after DOM changes.
• Polyfills and Compatibility - Responsive image polyfill for srcset and sizes.
• General Utilities - Responsive image polyfill for older browsers.

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