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1. Use svg image if supported - fallbac... Use svg image if supported - fallback to png if not (Using Modernizr check for svg)

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   // Swap SVG to PNG of the same name on unsupported browsers

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   // Requires Modernizr with SVG: https://modernizr.com/download?svg-svgasimg-setclasses&q=svg

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   if (!Modernizr.svg) {

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       var imgs = document.getElementsByTagName('img');

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       var svgExtension = /.*\.svg$/