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picturefill - v3.0.2 - 2016-02-12\n * https://scottjehl.github.io/picturefill/\n * Copyright (c) 2016 https://github.com/scottjehl/picturefill/blob/master/Authors.txt; Licensed MIT\n */\n/*! Gecko-Picture - v1.0\n * https://github.com/scottjehl/picturefill/tree/3.0/src/plugins/gecko-picture\n * Firefox's early picture implementation (prior to FF41) is static and does\n * not react to viewport changes. This tiny module fixes this.\n */\n(function(window) {\n\t/*jshint eqnull:true */\n\tvar ua = navigator.userAgent;\n\n\tif ( window.HTMLPictureElement && ((/ecko/).test(ua) && ua.match(/rv\\:(\\d+)/) && RegExp.$1 < 45) ) {\n\t\taddEventListener(\"resize\", (function() {\n\t\t\tvar timer;\n\n\t\t\tvar dummySrc = document.createElement(\"source\");\n\n\t\t\tvar fixRespimg = function(img) {\n\t\t\t\tvar source, sizes;\n\t\t\t\tvar picture = img.parentNode;\n\n\t\t\t\tif (picture.nodeName.toUpperCase() === \"PICTURE\") {\n\t\t\t\t\tsource = dummySrc.cloneNode();\n\n\t\t\t\t\tpicture.insertBefore(source, picture.firstElementChild);\n\t\t\t\t\tsetTimeout(function() {\n\t\t\t\t\t\tpicture.removeChild(source);\n\t\t\t\t\t});\n\t\t\t\t} else if (!img._pfLastSize || img.offsetWidth > img._pfLastSize) {\n\t\t\t\t\timg._pfLastSize = img.offsetWidth;\n\t\t\t\t\tsizes = img.sizes;\n\t\t\t\t\timg.sizes += \",100vw\";\n\t\t\t\t\tsetTimeout(function() {\n\t\t\t\t\t\timg.sizes = sizes;\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t};\n\n\t\t\tvar findPictureImgs = function() {\n\t\t\t\tvar i;\n\t\t\t\tvar imgs = document.querySelectorAll(\"picture > img, img[srcset][sizes]\");\n\t\t\t\tfor (i = 0; i < imgs.length; i++) {\n\t\t\t\t\tfixRespimg(imgs[i]);\n\t\t\t\t}\n\t\t\t};\n\t\t\tvar onResize = function() {\n\t\t\t\tclearTimeout(timer);\n\t\t\t\ttimer = setTimeout(findPictureImgs, 99);\n\t\t\t};\n\t\t\tvar mq = window.matchMedia && matchMedia(\"(orientation: landscape)\");\n\t\t\tvar init = function() {\n\t\t\t\tonResize();\n\n\t\t\t\tif (mq && mq.addListener) {\n\t\t\t\t\tmq.addListener(onResize);\n\t\t\t\t}\n\t\t\t};\n\n\t\t\tdummySrc.srcset = \"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\";\n\n\t\t\tif (/^[c|i]|d$/.test(document.readyState || \"\")) {\n\t\t\t\tinit();\n\t\t\t} else {\n\t\t\t\tdocument.addEventListener(\"DOMContentLoaded\", init);\n\t\t\t}\n\n\t\t\treturn onResize;\n\t\t})());\n\t}\n})(window);\n\n/*! Picturefill - v3.0.2\n * http://scottjehl.github.io/picturefill\n * Copyright (c) 2015 https://github.com/scottjehl/picturefill/blob/master/Authors.txt;\n *  License: MIT\n */\n\n(function( window, document, undefined ) {\n\t// Enable strict mode\n\t\"use strict\";\n\n\t// HTML shim|v it for old IE (IE9 will still need the HTML video tag workaround)\n\tdocument.createElement( \"picture\" );\n\n\tvar warn, eminpx, alwaysCheckWDescriptor, evalId;\n\t// local object for method references and testing exposure\n\tvar pf = {};\n\tvar isSupportTestReady = false;\n\tvar noop = function() {};\n\tvar image = document.createElement( \"img\" );\n\tvar getImgAttr = image.getAttribute;\n\tvar setImgAttr = image.setAttribute;\n\tvar removeImgAttr = image.removeAttribute;\n\tvar docElem = document.documentElement;\n\tvar types = {};\n\tvar cfg = {\n\t\t//resource selection:\n\t\talgorithm: \"\"\n\t};\n\tvar srcAttr = \"data-pfsrc\";\n\tvar srcsetAttr = srcAttr + \"set\";\n\t// ua sniffing is done for undetectable img loading features,\n\t// to do some non crucial perf optimizations\n\tvar ua = navigator.userAgent;\n\tvar supportAbort = (/rident/).test(ua) || ((/ecko/).test(ua) && ua.match(/rv\\:(\\d+)/) && RegExp.$1 > 35 );\n\tvar curSrcProp = \"currentSrc\";\n\tvar regWDesc = /\\s+\\+?\\d+(e\\d+)?w/;\n\tvar regSize = /(\\([^)]+\\))?\\s*(.+)/;\n\tvar setOptions = window.picturefillCFG;\n\t/**\n\t * Shortcut property for https://w3c.github.io/webappsec/specs/mixedcontent/#restricts-mixed-content ( for easy overriding in tests )\n\t */\n\t// baseStyle also used by getEmValue (i.e.: width: 1em is important)\n\tvar baseStyle = \"position:absolute;left:0;visibility:hidden;display:block;padding:0;border:none;font-size:1em;width:1em;overflow:hidden;clip:rect(0px, 0px, 0px, 0px)\";\n\tvar fsCss = \"font-size:100%!important;\";\n\tvar isVwDirty = true;\n\n\tvar cssCache = {};\n\tvar sizeLengthCache = {};\n\tvar DPR = window.devicePixelRatio;\n\tvar units = {\n\t\tpx: 1,\n\t\t\"in\": 96\n\t};\n\tvar anchor = document.createElement( \"a\" );\n\t/**\n\t * alreadyRun flag used for setOptions. is it true setOptions will reevaluate\n\t * @type {boolean}\n\t */\n\tvar alreadyRun = false;\n\n\t// Reusable, non-\"g\" Regexes\n\n\t// (Don't use \\s, to avoid matching non-breaking space.)\n\tvar regexLeadingSpaces = /^[ \\t\\n\\r\\u000c]+/,\n\t    regexLeadingCommasOrSpaces = /^[, \\t\\n\\r\\u000c]+/,\n\t    regexLeadingNotSpaces = /^[^ \\t\\n\\r\\u000c]+/,\n\t    regexTrailingCommas = /[,]+$/,\n\t    regexNonNegativeInteger = /^\\d+$/,\n\n\t    // ( Positive or negative or unsigned integers or decimals, without or without exponents.\n\t    // Must include at least one digit.\n\t    // According to spec tests any decimal point must be followed by a digit.\n\t    // No leading plus sign is allowed.)\n\t    // https://html.spec.whatwg.org/multipage/infrastructure.html#valid-floating-point-number\n\t    regexFloatingPoint = /^-?(?:[0-9]+|[0-9]*\\.[0-9]+)(?:[eE][+-]?[0-9]+)?$/;\n\n\tvar on = function(obj, evt, fn, capture) {\n\t\tif ( obj.addEventListener ) {\n\t\t\tobj.addEventListener(evt, fn, capture || false);\n\t\t} else if ( obj.attachEvent ) {\n\t\t\tobj.attachEvent( \"on\" + evt, fn);\n\t\t}\n\t};\n\n\t/**\n\t * simple memoize function:\n\t */\n\n\tvar memoize = function(fn) {\n\t\tvar cache = {};\n\t\treturn function(input) {\n\t\t\tif ( !(input in cache) ) {\n\t\t\t\tcache[ input ] = fn(input);\n\t\t\t}\n\t\t\treturn cache[ input ];\n\t\t};\n\t};\n\n\t// UTILITY FUNCTIONS\n\n\t// Manual is faster than RegEx\n\t// http://jsperf.com/whitespace-character/5\n\tfunction isSpace(c) {\n\t\treturn (c === \"\\u0020\" || // space\n\t\t        c === \"\\u0009\" || // horizontal tab\n\t\t        c === \"\\u000A\" || // new line\n\t\t        c === \"\\u000C\" || // form feed\n\t\t        c === \"\\u000D\");  // carriage return\n\t}\n\n\t/**\n\t * gets a mediaquery and returns a boolean or gets a css length and returns a number\n\t * @param css mediaqueries or css length\n\t * @returns {boolean|number}\n\t *\n\t * based on: https://gist.github.com/jonathantneal/db4f77009b155f083738\n\t */\n\tvar evalCSS = (function() {\n\n\t\tvar regLength = /^([\\d\\.]+)(em|vw|px)$/;\n\t\tvar replace = function() {\n\t\t\tvar args = arguments, index = 0, string = args[0];\n\t\t\twhile (++index in args) {\n\t\t\t\tstring = string.replace(args[index], args[++index]);\n\t\t\t}\n\t\t\treturn string;\n\t\t};\n\n\t\tvar buildStr = memoize(function(css) {\n\n\t\t\treturn \"return \" + replace((css || \"\").toLowerCase(),\n\t\t\t\t// interpret `and`\n\t\t\t\t/\\band\\b/g, \"&&\",\n\n\t\t\t\t// interpret `,`\n\t\t\t\t/,/g, \"||\",\n\n\t\t\t\t// interpret `min-` as >=\n\t\t\t\t/min-([a-z-\\s]+):/g, \"e.$1>=\",\n\n\t\t\t\t// interpret `max-` as <=\n\t\t\t\t/max-([a-z-\\s]+):/g, \"e.$1<=\",\n\n\t\t\t\t//calc value\n\t\t\t\t/calc([^)]+)/g, \"($1)\",\n\n\t\t\t\t// interpret css values\n\t\t\t\t/(\\d+[\\.]*[\\d]*)([a-z]+)/g, \"($1 * e.$2)\",\n\t\t\t\t//make eval less evil\n\t\t\t\t/^(?!(e.[a-z]|[0-9\\.&=|><\\+\\-\\*\\(\\)\\/])).*/ig, \"\"\n\t\t\t) + \";\";\n\t\t});\n\n\t\treturn function(css, length) {\n\t\t\tvar parsedLength;\n\t\t\tif (!(css in cssCache)) {\n\t\t\t\tcssCache[css] = false;\n\t\t\t\tif (length && (parsedLength = css.match( regLength ))) {\n\t\t\t\t\tcssCache[css] = parsedLength[ 1 ] * units[parsedLength[ 2 ]];\n\t\t\t\t} else {\n\t\t\t\t\t/*jshint evil:true */\n\t\t\t\t\ttry{\n\t\t\t\t\t\tcssCache[css] = new Function(\"e\", buildStr(css))(units);\n\t\t\t\t\t} catch(e) {}\n\t\t\t\t\t/*jshint evil:false */\n\t\t\t\t}\n\t\t\t}\n\t\t\treturn cssCache[css];\n\t\t};\n\t})();\n\n\tvar setResolution = function( candidate, sizesattr ) {\n\t\tif ( candidate.w ) { // h = means height: || descriptor.type === 'h' do not handle yet...\n\t\t\tcandidate.cWidth = pf.calcListLength( sizesattr || \"100vw\" );\n\t\t\tcandidate.res = candidate.w / candidate.cWidth ;\n\t\t} else {\n\t\t\tcandidate.res = candidate.d;\n\t\t}\n\t\treturn candidate;\n\t};\n\n\t/**\n\t *\n\t * @param opt\n\t */\n\tvar picturefill = function( opt ) {\n\n\t\tif (!isSupportTestReady) {return;}\n\n\t\tvar elements, i, plen;\n\n\t\tvar options = opt || {};\n\n\t\tif ( options.elements && options.elements.nodeType === 1 ) {\n\t\t\tif ( options.elements.nodeName.toUpperCase() === \"IMG\" ) {\n\t\t\t\toptions.elements =  [ options.elements ];\n\t\t\t} else {\n\t\t\t\toptions.context = options.elements;\n\t\t\t\toptions.elements =  null;\n\t\t\t}\n\t\t}\n\n\t\telements = options.elements || pf.qsa( (options.context || document), ( options.reevaluate || options.reselect ) ? pf.sel : pf.selShort );\n\n\t\tif ( (plen = elements.length) ) {\n\n\t\t\tpf.setupRun( options );\n\t\t\talreadyRun = true;\n\n\t\t\t// Loop through all elements\n\t\t\tfor ( i = 0; i < plen; i++ ) {\n\t\t\t\tpf.fillImg(elements[ i ], options);\n\t\t\t}\n\n\t\t\tpf.teardownRun( options );\n\t\t}\n\t};\n\n\t/**\n\t * outputs a warning for the developer\n\t * @param {message}\n\t * @type {Function}\n\t */\n\twarn = ( window.console && console.warn ) ?\n\t\tfunction( message ) {\n\t\t\tconsole.warn( message );\n\t\t} :\n\t\tnoop\n\t;\n\n\tif ( !(curSrcProp in image) ) {\n\t\tcurSrcProp = \"src\";\n\t}\n\n\t// Add support for standard mime types.\n\ttypes[ \"image/jpeg\" ] = true;\n\ttypes[ \"image/gif\" ] = true;\n\ttypes[ \"image/png\" ] = true;\n\n\tfunction detectTypeSupport( type, typeUri ) {\n\t\t// based on Modernizr's lossless img-webp test\n\t\t// note: asynchronous\n\t\tvar image = new window.Image();\n\t\timage.onerror = function() {\n\t\t\ttypes[ type ] = false;\n\t\t\tpicturefill();\n\t\t};\n\t\timage.onload = function() {\n\t\t\ttypes[ type ] = image.width === 1;\n\t\t\tpicturefill();\n\t\t};\n\t\timage.src = typeUri;\n\t\treturn \"pending\";\n\t}\n\n\t// test svg support\n\ttypes[ \"image/svg+xml\" ] = document.implementation.hasFeature( \"http://www.w3.org/TR/SVG11/feature#Image\", \"1.1\" );\n\n\t/**\n\t * updates the internal vW property with the current viewport width in px\n\t */\n\tfunction updateMetrics() {\n\n\t\tisVwDirty = false;\n\t\tDPR = window.devicePixelRatio;\n\t\tcssCache = {};\n\t\tsizeLengthCache = {};\n\n\t\tpf.DPR = DPR || 1;\n\n\t\tunits.width = Math.max(window.innerWidth || 0, docElem.clientWidth);\n\t\tunits.height = Math.max(window.innerHeight || 0, docElem.clientHeight);\n\n\t\tunits.vw = units.width / 100;\n\t\tunits.vh = units.height / 100;\n\n\t\tevalId = [ units.height, units.width, DPR ].join(\"-\");\n\n\t\tunits.em = pf.getEmValue();\n\t\tunits.rem = units.em;\n\t}\n\n\tfunction chooseLowRes( lowerValue, higherValue, dprValue, isCached ) {\n\t\tvar bonusFactor, tooMuch, bonus, meanDensity;\n\n\t\t//experimental\n\t\tif (cfg.algorithm === \"saveData\" ){\n\t\t\tif ( lowerValue > 2.7 ) {\n\t\t\t\tmeanDensity = dprValue + 1;\n\t\t\t} else {\n\t\t\t\ttooMuch = higherValue - dprValue;\n\t\t\t\tbonusFactor = Math.pow(lowerValue - 0.6, 1.5);\n\n\t\t\t\tbonus = tooMuch * bonusFactor;\n\n\t\t\t\tif (isCached) {\n\t\t\t\t\tbonus += 0.1 * bonusFactor;\n\t\t\t\t}\n\n\t\t\t\tmeanDensity = lowerValue + bonus;\n\t\t\t}\n\t\t} else {\n\t\t\tmeanDensity = (dprValue > 1) ?\n\t\t\t\tMath.sqrt(lowerValue * higherValue) :\n\t\t\t\tlowerValue;\n\t\t}\n\n\t\treturn meanDensity > dprValue;\n\t}\n\n\tfunction applyBestCandidate( img ) {\n\t\tvar srcSetCandidates;\n\t\tvar matchingSet = pf.getSet( img );\n\t\tvar evaluated = false;\n\t\tif ( matchingSet !== \"pending\" ) {\n\t\t\tevaluated = evalId;\n\t\t\tif ( matchingSet ) {\n\t\t\t\tsrcSetCandidates = pf.setRes( matchingSet );\n\t\t\t\tpf.applySetCandidate( srcSetCandidates, img );\n\t\t\t}\n\t\t}\n\t\timg[ pf.ns ].evaled = evaluated;\n\t}\n\n\tfunction ascendingSort( a, b ) {\n\t\treturn a.res - b.res;\n\t}\n\n\tfunction setSrcToCur( img, src, set ) {\n\t\tvar candidate;\n\t\tif ( !set && src ) {\n\t\t\tset = img[ pf.ns ].sets;\n\t\t\tset = set && set[set.length - 1];\n\t\t}\n\n\t\tcandidate = getCandidateForSrc(src, set);\n\n\t\tif ( candidate ) {\n\t\t\tsrc = pf.makeUrl(src);\n\t\t\timg[ pf.ns ].curSrc = src;\n\t\t\timg[ pf.ns ].curCan = candidate;\n\n\t\t\tif ( !candidate.res ) {\n\t\t\t\tsetResolution( candidate, candidate.set.sizes );\n\t\t\t}\n\t\t}\n\t\treturn candidate;\n\t}\n\n\tfunction getCandidateForSrc( src, set ) {\n\t\tvar i, candidate, candidates;\n\t\tif ( src && set ) {\n\t\t\tcandidates = pf.parseSet( set );\n\t\t\tsrc = pf.makeUrl(src);\n\t\t\tfor ( i = 0; i < candidates.length; i++ ) {\n\t\t\t\tif ( src === pf.makeUrl(candidates[ i ].url) ) {\n\t\t\t\t\tcandidate = candidates[ i ];\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn candidate;\n\t}\n\n\tfunction getAllSourceElements( picture, candidates ) {\n\t\tvar i, len, source, srcset;\n\n\t\t// SPEC mismatch intended for size and perf:\n\t\t// actually only source elements preceding the img should be used\n\t\t// also note: don't use qsa here, because IE8 sometimes doesn't like source as the key part in a selector\n\t\tvar sources = picture.getElementsByTagName( \"source\" );\n\n\t\tfor ( i = 0, len = sources.length; i < len; i++ ) {\n\t\t\tsource = sources[ i ];\n\t\t\tsource[ pf.ns ] = true;\n\t\t\tsrcset = source.getAttribute( \"srcset\" );\n\n\t\t\t// if source does not have a srcset attribute, skip\n\t\t\tif ( srcset ) {\n\t\t\t\tcandidates.push( {\n\t\t\t\t\tsrcset: srcset,\n\t\t\t\t\tmedia: source.getAttribute( \"media\" ),\n\t\t\t\t\ttype: source.getAttribute( \"type\" ),\n\t\t\t\t\tsizes: source.getAttribute( \"sizes\" )\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Srcset Parser\n\t * By Alex Bell |  MIT License\n\t *\n\t * @returns Array [{url: _, d: _, w: _, h:_, set:_(????)}, ...]\n\t *\n\t * Based super duper closely on the reference algorithm at:\n\t * https://html.spec.whatwg.org/multipage/embedded-content.html#parse-a-srcset-attribute\n\t */\n\n\t// 1. Let input be the value passed to this algorithm.\n\t// (TO-DO : Explain what \"set\" argument is here. Maybe choose a more\n\t// descriptive & more searchable name.  Since passing the \"set\" in really has\n\t// nothing to do with parsing proper, I would prefer this assignment eventually\n\t// go in an external fn.)\n\tfunction parseSrcset(input, set) {\n\n\t\tfunction collectCharacters(regEx) {\n\t\t\tvar chars,\n\t\t\t    match = regEx.exec(input.substring(pos));\n\t\t\tif (match) {\n\t\t\t\tchars = match[ 0 ];\n\t\t\t\tpos += chars.length;\n\t\t\t\treturn chars;\n\t\t\t}\n\t\t}\n\n\t\tvar inputLength = input.length,\n\t\t    url,\n\t\t    descriptors,\n\t\t    currentDescriptor,\n\t\t    state,\n\t\t    c,\n\n\t\t    // 2. Let position be a pointer into input, initially pointing at the start\n\t\t    //    of the string.\n\t\t    pos = 0,\n\n\t\t    // 3. Let candidates be an initially empty source set.\n\t\t    candidates = [];\n\n\t\t/**\n\t\t* Adds descriptor properties to a candidate, pushes to the candidates array\n\t\t* @return undefined\n\t\t*/\n\t\t// (Declared outside of the while loop so that it's only created once.\n\t\t// (This fn is defined before it is used, in order to pass JSHINT.\n\t\t// Unfortunately this breaks the sequencing of the spec comments. :/ )\n\t\tfunction parseDescriptors() {\n\n\t\t\t// 9. Descriptor parser: Let error be no.\n\t\t\tvar pError = false,\n\n\t\t\t// 10. Let width be absent.\n\t\t\t// 11. Let density be absent.\n\t\t\t// 12. Let future-compat-h be absent. (We're implementing it now as h)\n\t\t\t    w, d, h, i,\n\t\t\t    candidate = {},\n\t\t\t    desc, lastChar, value, intVal, floatVal;\n\n\t\t\t// 13. For each descriptor in descriptors, run the appropriate set of steps\n\t\t\t// from the following list:\n\t\t\tfor (i = 0 ; i < descriptors.length; i++) {\n\t\t\t\tdesc = descriptors[ i ];\n\n\t\t\t\tlastChar = desc[ desc.length - 1 ];\n\t\t\t\tvalue = desc.substring(0, desc.length - 1);\n\t\t\t\tintVal = parseInt(value, 10);\n\t\t\t\tfloatVal = parseFloat(value);\n\n\t\t\t\t// If the descriptor consists of a valid non-negative integer followed by\n\t\t\t\t// a U+0077 LATIN SMALL LETTER W character\n\t\t\t\tif (regexNonNegativeInteger.test(value) && (lastChar === \"w\")) {\n\n\t\t\t\t\t// If width and density are not both absent, then let error be yes.\n\t\t\t\t\tif (w || d) {pError = true;}\n\n\t\t\t\t\t// Apply the rules for parsing non-negative integers to the descriptor.\n\t\t\t\t\t// If the result is zero, let error be yes.\n\t\t\t\t\t// Otherwise, let width be the result.\n\t\t\t\t\tif (intVal === 0) {pError = true;} else {w = intVal;}\n\n\t\t\t\t// If the descriptor consists of a valid floating-point number followed by\n\t\t\t\t// a U+0078 LATIN SMALL LETTER X character\n\t\t\t\t} else if (regexFloatingPoint.test(value) && (lastChar === \"x\")) {\n\n\t\t\t\t\t// If width, density and future-compat-h are not all absent, then let error\n\t\t\t\t\t// be yes.\n\t\t\t\t\tif (w || d || h) {pError = true;}\n\n\t\t\t\t\t// Apply the rules for parsing floating-point number values to the descriptor.\n\t\t\t\t\t// If the result is less than zero, let error be yes. Otherwise, let density\n\t\t\t\t\t// be the result.\n\t\t\t\t\tif (floatVal < 0) {pError = true;} else {d = floatVal;}\n\n\t\t\t\t// If the descriptor consists of a valid non-negative integer followed by\n\t\t\t\t// a U+0068 LATIN SMALL LETTER H character\n\t\t\t\t} else if (regexNonNegativeInteger.test(value) && (lastChar === \"h\")) {\n\n\t\t\t\t\t// If height and density are not both absent, then let error be yes.\n\t\t\t\t\tif (h || d) {pError = true;}\n\n\t\t\t\t\t// Apply the rules for parsing non-negative integers to the descriptor.\n\t\t\t\t\t// If the result is zero, let error be yes. Otherwise, let future-compat-h\n\t\t\t\t\t// be the result.\n\t\t\t\t\tif (intVal === 0) {pError = true;} else {h = intVal;}\n\n\t\t\t\t// Anything else, Let error be yes.\n\t\t\t\t} else {pError = true;}\n\t\t\t} // (close step 13 for loop)\n\n\t\t\t// 15. If error is still no, then append a new image source to candidates whose\n\t\t\t// URL is url, associated with a width width if not absent and a pixel\n\t\t\t// density density if not absent. Otherwise, there is a parse error.\n\t\t\tif (!pError) {\n\t\t\t\tcandidate.url = url;\n\n\t\t\t\tif (w) { candidate.w = w;}\n\t\t\t\tif (d) { candidate.d = d;}\n\t\t\t\tif (h) { candidate.h = h;}\n\t\t\t\tif (!h && !d && !w) {candidate.d = 1;}\n\t\t\t\tif (candidate.d === 1) {set.has1x = true;}\n\t\t\t\tcandidate.set = set;\n\n\t\t\t\tcandidates.push(candidate);\n\t\t\t}\n\t\t} // (close parseDescriptors fn)\n\n\t\t/**\n\t\t* Tokenizes descriptor properties prior to parsing\n\t\t* Returns undefined.\n\t\t* (Again, this fn is defined before it is used, in order to pass JSHINT.\n\t\t* Unfortunately this breaks the logical sequencing of the spec comments. :/ )\n\t\t*/\n\t\tfunction tokenize() {\n\n\t\t\t// 8.1. Descriptor tokeniser: Skip whitespace\n\t\t\tcollectCharacters(regexLeadingSpaces);\n\n\t\t\t// 8.2. Let current descriptor be the empty string.\n\t\t\tcurrentDescriptor = \"\";\n\n\t\t\t// 8.3. Let state be in descriptor.\n\t\t\tstate = \"in descriptor\";\n\n\t\t\twhile (true) {\n\n\t\t\t\t// 8.4. Let c be the character at position.\n\t\t\t\tc = input.charAt(pos);\n\n\t\t\t\t//  Do the following depending on the value of state.\n\t\t\t\t//  For the purpose of this step, \"EOF\" is a special character representing\n\t\t\t\t//  that position is past the end of input.\n\n\t\t\t\t// In descriptor\n\t\t\t\tif (state === \"in descriptor\") {\n\t\t\t\t\t// Do the following, depending on the value of c:\n\n\t\t\t\t  // Space character\n\t\t\t\t  // If current descriptor is not empty, append current descriptor to\n\t\t\t\t  // descriptors and let current descriptor be the empty string.\n\t\t\t\t  // Set state to after descriptor.\n\t\t\t\t\tif (isSpace(c)) {\n\t\t\t\t\t\tif (currentDescriptor) {\n\t\t\t\t\t\t\tdescriptors.push(currentDescriptor);\n\t\t\t\t\t\t\tcurrentDescriptor = \"\";\n\t\t\t\t\t\t\tstate = \"after descriptor\";\n\t\t\t\t\t\t}\n\n\t\t\t\t\t// U+002C COMMA (,)\n\t\t\t\t\t// Advance position to the next character in input. If current descriptor\n\t\t\t\t\t// is not empty, append current descriptor to descriptors. Jump to the step\n\t\t\t\t\t// labeled descriptor parser.\n\t\t\t\t\t} else if (c === \",\") {\n\t\t\t\t\t\tpos += 1;\n\t\t\t\t\t\tif (currentDescriptor) {\n\t\t\t\t\t\t\tdescriptors.push(currentDescriptor);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tparseDescriptors();\n\t\t\t\t\t\treturn;\n\n\t\t\t\t\t// U+0028 LEFT PARENTHESIS (()\n\t\t\t\t\t// Append c to current descriptor. Set state to in parens.\n\t\t\t\t\t} else if (c === \"\\u0028\") {\n\t\t\t\t\t\tcurrentDescriptor = currentDescriptor + c;\n\t\t\t\t\t\tstate = \"in parens\";\n\n\t\t\t\t\t// EOF\n\t\t\t\t\t// If current descriptor is not empty, append current descriptor to\n\t\t\t\t\t// descriptors. Jump to the step labeled descriptor parser.\n\t\t\t\t\t} else if (c === \"\") {\n\t\t\t\t\t\tif (currentDescriptor) {\n\t\t\t\t\t\t\tdescriptors.push(currentDescriptor);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tparseDescriptors();\n\t\t\t\t\t\treturn;\n\n\t\t\t\t\t// Anything else\n\t\t\t\t\t// Append c to current descriptor.\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcurrentDescriptor = currentDescriptor + c;\n\t\t\t\t\t}\n\t\t\t\t// (end \"in descriptor\"\n\n\t\t\t\t// In parens\n\t\t\t\t} else if (state === \"in parens\") {\n\n\t\t\t\t\t// U+0029 RIGHT PARENTHESIS ())\n\t\t\t\t\t// Append c to current descriptor. Set state to in descriptor.\n\t\t\t\t\tif (c === \")\") {\n\t\t\t\t\t\tcurrentDescriptor = currentDescriptor + c;\n\t\t\t\t\t\tstate = \"in descriptor\";\n\n\t\t\t\t\t// EOF\n\t\t\t\t\t// Append current descriptor to descriptors. Jump to the step labeled\n\t\t\t\t\t// descriptor parser.\n\t\t\t\t\t} else if (c === \"\") {\n\t\t\t\t\t\tdescriptors.push(currentDescriptor);\n\t\t\t\t\t\tparseDescriptors();\n\t\t\t\t\t\treturn;\n\n\t\t\t\t\t// Anything else\n\t\t\t\t\t// Append c to current descriptor.\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcurrentDescriptor = currentDescriptor + c;\n\t\t\t\t\t}\n\n\t\t\t\t// After descriptor\n\t\t\t\t} else if (state === \"after descriptor\") {\n\n\t\t\t\t\t// Do the following, depending on the value of c:\n\t\t\t\t\t// Space character: Stay in this state.\n\t\t\t\t\tif (isSpace(c)) {\n\n\t\t\t\t\t// EOF: Jump to the step labeled descriptor parser.\n\t\t\t\t\t} else if (c === \"\") {\n\t\t\t\t\t\tparseDescriptors();\n\t\t\t\t\t\treturn;\n\n\t\t\t\t\t// Anything else\n\t\t\t\t\t// Set state to in descriptor. Set position to the previous character in input.\n\t\t\t\t\t} else {\n\t\t\t\t\t\tstate = \"in descriptor\";\n\t\t\t\t\t\tpos -= 1;\n\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Advance position to the next character in input.\n\t\t\t\tpos += 1;\n\n\t\t\t// Repeat this step.\n\t\t\t} // (close while true loop)\n\t\t}\n\n\t\t// 4. Splitting loop: Collect a sequence of characters that are space\n\t\t//    characters or U+002C COMMA characters. If any U+002C COMMA characters\n\t\t//    were collected, that is a parse error.\n\t\twhile (true) {\n\t\t\tcollectCharacters(regexLeadingCommasOrSpaces);\n\n\t\t\t// 5. If position is past the end of input, return candidates and abort these steps.\n\t\t\tif (pos >= inputLength) {\n\t\t\t\treturn candidates; // (we're done, this is the sole return path)\n\t\t\t}\n\n\t\t\t// 6. Collect a sequence of characters that are not space characters,\n\t\t\t//    and let that be url.\n\t\t\turl = collectCharacters(regexLeadingNotSpaces);\n\n\t\t\t// 7. Let descriptors be a new empty list.\n\t\t\tdescriptors = [];\n\n\t\t\t// 8. If url ends with a U+002C COMMA character (,), follow these substeps:\n\t\t\t//\t\t(1). Remove all trailing U+002C COMMA characters from url. If this removed\n\t\t\t//         more than one character, that is a parse error.\n\t\t\tif (url.slice(-1) === \",\") {\n\t\t\t\turl = url.replace(regexTrailingCommas, \"\");\n\t\t\t\t// (Jump ahead to step 9 to skip tokenization and just push the candidate).\n\t\t\t\tparseDescriptors();\n\n\t\t\t//\tOtherwise, follow these substeps:\n\t\t\t} else {\n\t\t\t\ttokenize();\n\t\t\t} // (close else of step 8)\n\n\t\t// 16. Return to the step labeled splitting loop.\n\t\t} // (Close of big while loop.)\n\t}\n\n\t/*\n\t * Sizes Parser\n\t *\n\t * By Alex Bell |  MIT License\n\t *\n\t * Non-strict but accurate and lightweight JS Parser for the string value <img sizes=\"here\">\n\t *\n\t * Reference algorithm at:\n\t * https://html.spec.whatwg.org/multipage/embedded-content.html#parse-a-sizes-attribute\n\t *\n\t * Most comments are copied in directly from the spec\n\t * (except for comments in parens).\n\t *\n\t * Grammar is:\n\t * <source-size-list> = <source-size># [ , <source-size-value> ]? | <source-size-value>\n\t * <source-size> = <media-condition> <source-size-value>\n\t * <source-size-value> = <length>\n\t * http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#attr-img-sizes\n\t *\n\t * E.g. \"(max-width: 30em) 100vw, (max-width: 50em) 70vw, 100vw\"\n\t * or \"(min-width: 30em), calc(30vw - 15px)\" or just \"30vw\"\n\t *\n\t * Returns the first valid <css-length> with a media condition that evaluates to true,\n\t * or \"100vw\" if all valid media conditions evaluate to false.\n\t *\n\t */\n\n\tfunction parseSizes(strValue) {\n\n\t\t// (Percentage CSS lengths are not allowed in this case, to avoid confusion:\n\t\t// https://html.spec.whatwg.org/multipage/embedded-content.html#valid-source-size-list\n\t\t// CSS allows a single optional plus or minus sign:\n\t\t// http://www.w3.org/TR/CSS2/syndata.html#numbers\n\t\t// CSS is ASCII case-insensitive:\n\t\t// http://www.w3.org/TR/CSS2/syndata.html#characters )\n\t\t// Spec allows exponential notation for <number> type:\n\t\t// http://dev.w3.org/csswg/css-values/#numbers\n\t\tvar regexCssLengthWithUnits = /^(?:[+-]?[0-9]+|[0-9]*\\.[0-9]+)(?:[eE][+-]?[0-9]+)?(?:ch|cm|em|ex|in|mm|pc|pt|px|rem|vh|vmin|vmax|vw)$/i;\n\n\t\t// (This is a quick and lenient test. Because of optional unlimited-depth internal\n\t\t// grouping parens and strict spacing rules, this could get very complicated.)\n\t\tvar regexCssCalc = /^calc\\((?:[0-9a-z \\.\\+\\-\\*\\/\\(\\)]+)\\)$/i;\n\n\t\tvar i;\n\t\tvar unparsedSizesList;\n\t\tvar unparsedSizesListLength;\n\t\tvar unparsedSize;\n\t\tvar lastComponentValue;\n\t\tvar size;\n\n\t\t// UTILITY FUNCTIONS\n\n\t\t//  (Toy CSS parser. The goals here are:\n\t\t//  1) expansive test coverage without the weight of a full CSS parser.\n\t\t//  2) Avoiding regex wherever convenient.\n\t\t//  Quick tests: http://jsfiddle.net/gtntL4gr/3/\n\t\t//  Returns an array of arrays.)\n\t\tfunction parseComponentValues(str) {\n\t\t\tvar chrctr;\n\t\t\tvar component = \"\";\n\t\t\tvar componentArray = [];\n\t\t\tvar listArray = [];\n\t\t\tvar parenDepth = 0;\n\t\t\tvar pos = 0;\n\t\t\tvar inComment = false;\n\n\t\t\tfunction pushComponent() {\n\t\t\t\tif (component) {\n\t\t\t\t\tcomponentArray.push(component);\n\t\t\t\t\tcomponent = \"\";\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tfunction pushComponentArray() {\n\t\t\t\tif (componentArray[0]) {\n\t\t\t\t\tlistArray.push(componentArray);\n\t\t\t\t\tcomponentArray = [];\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// (Loop forwards from the beginning of the string.)\n\t\t\twhile (true) {\n\t\t\t\tchrctr = str.charAt(pos);\n\n\t\t\t\tif (chrctr === \"\") { // ( End of string reached.)\n\t\t\t\t\tpushComponent();\n\t\t\t\t\tpushComponentArray();\n\t\t\t\t\treturn listArray;\n\t\t\t\t} else if (inComment) {\n\t\t\t\t\tif ((chrctr === \"*\") && (str[pos + 1] === \"/\")) { // (At end of a comment.)\n\t\t\t\t\t\tinComment = false;\n\t\t\t\t\t\tpos += 2;\n\t\t\t\t\t\tpushComponent();\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t} else {\n\t\t\t\t\t\tpos += 1; // (Skip all characters inside comments.)\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\t\t\t\t} else if (isSpace(chrctr)) {\n\t\t\t\t\t// (If previous character in loop was also a space, or if\n\t\t\t\t\t// at the beginning of the string, do not add space char to\n\t\t\t\t\t// component.)\n\t\t\t\t\tif ( (str.charAt(pos - 1) && isSpace( str.charAt(pos - 1) ) ) || !component ) {\n\t\t\t\t\t\tpos += 1;\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t} else if (parenDepth === 0) {\n\t\t\t\t\t\tpushComponent();\n\t\t\t\t\t\tpos +=1;\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t} else {\n\t\t\t\t\t\t// (Replace any space character with a plain space for legibility.)\n\t\t\t\t\t\tchrctr = \" \";\n\t\t\t\t\t}\n\t\t\t\t} else if (chrctr === \"(\") {\n\t\t\t\t\tparenDepth += 1;\n\t\t\t\t} else if (chrctr === \")\") {\n\t\t\t\t\tparenDepth -= 1;\n\t\t\t\t} else if (chrctr === \",\") {\n\t\t\t\t\tpushComponent();\n\t\t\t\t\tpushComponentArray();\n\t\t\t\t\tpos += 1;\n\t\t\t\t\tcontinue;\n\t\t\t\t} else if ( (chrctr === \"/\") && (str.charAt(pos + 1) === \"*\") ) {\n\t\t\t\t\tinComment = true;\n\t\t\t\t\tpos += 2;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tcomponent = component + chrctr;\n\t\t\t\tpos += 1;\n\t\t\t}\n\t\t}\n\n\t\tfunction isValidNonNegativeSourceSizeValue(s) {\n\t\t\tif (regexCssLengthWithUnits.test(s) && (parseFloat(s) >= 0)) {return true;}\n\t\t\tif (regexCssCalc.test(s)) {return true;}\n\t\t\t// ( http://www.w3.org/TR/CSS2/syndata.html#numbers says:\n\t\t\t// \"-0 is equivalent to 0 and is not a negative number.\" which means that\n\t\t\t// unitless zero and unitless negative zero must be accepted as special cases.)\n\t\t\tif ((s === \"0\") || (s === \"-0\") || (s === \"+0\")) {return true;}\n\t\t\treturn false;\n\t\t}\n\n\t\t// When asked to parse a sizes attribute from an element, parse a\n\t\t// comma-separated list of component values from the value of the element's\n\t\t// sizes attribute (or the empty string, if the attribute is absent), and let\n\t\t// unparsed sizes list be the result.\n\t\t// http://dev.w3.org/csswg/css-syntax/#parse-comma-separated-list-of-component-values\n\n\t\tunparsedSizesList = parseComponentValues(strValue);\n\t\tunparsedSizesListLength = unparsedSizesList.length;\n\n\t\t// For each unparsed size in unparsed sizes list:\n\t\tfor (i = 0; i < unparsedSizesListLength; i++) {\n\t\t\tunparsedSize = unparsedSizesList[i];\n\n\t\t\t// 1. Remove all consecutive <whitespace-token>s from the end of unparsed size.\n\t\t\t// ( parseComponentValues() already omits spaces outside of parens. )\n\n\t\t\t// If unparsed size is now empty, that is a parse error; continue to the next\n\t\t\t// iteration of this algorithm.\n\t\t\t// ( parseComponentValues() won't push an empty array. )\n\n\t\t\t// 2. If the last component value in unparsed size is a valid non-negative\n\t\t\t// <source-size-value>, let size be its value and remove the component value\n\t\t\t// from unparsed size. Any CSS function other than the calc() function is\n\t\t\t// invalid. Otherwise, there is a parse error; continue to the next iteration\n\t\t\t// of this algorithm.\n\t\t\t// http://dev.w3.org/csswg/css-syntax/#parse-component-value\n\t\t\tlastComponentValue = unparsedSize[unparsedSize.length - 1];\n\n\t\t\tif (isValidNonNegativeSourceSizeValue(lastComponentValue)) {\n\t\t\t\tsize = lastComponentValue;\n\t\t\t\tunparsedSize.pop();\n\t\t\t} else {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// 3. Remove all consecutive <whitespace-token>s from the end of unparsed\n\t\t\t// size. If unparsed size is now empty, return size and exit this algorithm.\n\t\t\t// If this was not the last item in unparsed sizes list, that is a parse error.\n\t\t\tif (unparsedSize.length === 0) {\n\t\t\t\treturn size;\n\t\t\t}\n\n\t\t\t// 4. Parse the remaining component values in unparsed size as a\n\t\t\t// <media-condition>. If it does not parse correctly, or it does parse\n\t\t\t// correctly but the <media-condition> evaluates to false, continue to the\n\t\t\t// next iteration of this algorithm.\n\t\t\t// (Parsing all possible compound media conditions in JS is heavy, complicated,\n\t\t\t// and the payoff is unclear. Is there ever an situation where the\n\t\t\t// media condition parses incorrectly but still somehow evaluates to true?\n\t\t\t// Can we just rely on the browser/polyfill to do it?)\n\t\t\tunparsedSize = unparsedSize.join(\" \");\n\t\t\tif (!(pf.matchesMedia( unparsedSize ) ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// 5. Return size and exit this algorithm.\n\t\t\treturn size;\n\t\t}\n\n\t\t// If the above algorithm exhausts unparsed sizes list without returning a\n\t\t// size value, return 100vw.\n\t\treturn \"100vw\";\n\t}\n\n\t// namespace\n\tpf.ns = (\"pf\" + new Date().getTime()).substr(0, 9);\n\n\t// srcset support test\n\tpf.supSrcset = \"srcset\" in image;\n\tpf.supSizes = \"sizes\" in image;\n\tpf.supPicture = !!window.HTMLPictureElement;\n\n\t// UC browser does claim to support srcset and picture, but not sizes,\n\t// this extended test reveals the browser does support nothing\n\tif (pf.supSrcset && pf.supPicture && !pf.supSizes) {\n\t\t(function(image2) {\n\t\t\timage.srcset = \"data:,a\";\n\t\t\timage2.src = \"data:,a\";\n\t\t\tpf.supSrcset = image.complete === image2.complete;\n\t\t\tpf.supPicture = pf.supSrcset && pf.supPicture;\n\t\t})(document.createElement(\"img\"));\n\t}\n\n\t// Safari9 has basic support for sizes, but does't expose the `sizes` idl attribute\n\tif (pf.supSrcset && !pf.supSizes) {\n\n\t\t(function() {\n\t\t\tvar width2 = \"data:image/gif;base64,R0lGODlhAgABAPAAAP///wAAACH5BAAAAAAALAAAAAACAAEAAAICBAoAOw==\";\n\t\t\tvar width1 = \"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\";\n\t\t\tvar img = document.createElement(\"img\");\n\t\t\tvar test = function() {\n\t\t\t\tvar width = img.width;\n\n\t\t\t\tif (width === 2) {\n\t\t\t\t\tpf.supSizes = true;\n\t\t\t\t}\n\n\t\t\t\talwaysCheckWDescriptor = pf.supSrcset && !pf.supSizes;\n\n\t\t\t\tisSupportTestReady = true;\n\t\t\t\t// force async\n\t\t\t\tsetTimeout(picturefill);\n\t\t\t};\n\n\t\t\timg.onload = test;\n\t\t\timg.onerror = test;\n\t\t\timg.setAttribute(\"sizes\", \"9px\");\n\n\t\t\timg.srcset = width1 + \" 1w,\" + width2 + \" 9w\";\n\t\t\timg.src = width1;\n\t\t})();\n\n\t} else {\n\t\tisSupportTestReady = true;\n\t}\n\n\t// using pf.qsa instead of dom traversing does scale much better,\n\t// especially on sites mixing responsive and non-responsive images\n\tpf.selShort = \"picture>img,img[srcset]\";\n\tpf.sel = pf.selShort;\n\tpf.cfg = cfg;\n\n\t/**\n\t * Shortcut property for `devicePixelRatio` ( for easy overriding in tests )\n\t */\n\tpf.DPR = (DPR  || 1 );\n\tpf.u = units;\n\n\t// container of supported mime types that one might need to qualify before using\n\tpf.types =  types;\n\n\tpf.setSize = noop;\n\n\t/**\n\t * Gets a string and returns the absolute URL\n\t * @param src\n\t * @returns {String} absolute URL\n\t */\n\n\tpf.makeUrl = memoize(function(src) {\n\t\tanchor.href = src;\n\t\treturn anchor.href;\n\t});\n\n\t/**\n\t * Gets a DOM element or document and a selctor and returns the found matches\n\t * Can be extended with jQuery/Sizzle for IE7 support\n\t * @param context\n\t * @param sel\n\t * @returns {NodeList|Array}\n\t */\n\tpf.qsa = function(context, sel) {\n\t\treturn ( \"querySelector\" in context ) ? context.querySelectorAll(sel) : [];\n\t};\n\n\t/**\n\t * Shortcut method for matchMedia ( for easy overriding in tests )\n\t * wether native or pf.mMQ is used will be decided lazy on first call\n\t * @returns {boolean}\n\t */\n\tpf.matchesMedia = function() {\n\t\tif ( window.matchMedia && (matchMedia( \"(min-width: 0.1em)\" ) || {}).matches ) {\n\t\t\tpf.matchesMedia = function( media ) {\n\t\t\t\treturn !media || ( matchMedia( media ).matches );\n\t\t\t};\n\t\t} else {\n\t\t\tpf.matchesMedia = pf.mMQ;\n\t\t}\n\n\t\treturn pf.matchesMedia.apply( this, arguments );\n\t};\n\n\t/**\n\t * A simplified matchMedia implementation for IE8 and IE9\n\t * handles only min-width/max-width with px or em values\n\t * @param media\n\t * @returns {boolean}\n\t */\n\tpf.mMQ = function( media ) {\n\t\treturn media ? evalCSS(media) : true;\n\t};\n\n\t/**\n\t * Returns the calculated length in css pixel from the given sourceSizeValue\n\t * http://dev.w3.org/csswg/css-values-3/#length-value\n\t * intended Spec mismatches:\n\t * * Does not check for invalid use of CSS functions\n\t * * Does handle a computed length of 0 the same as a negative and therefore invalid value\n\t * @param sourceSizeValue\n\t * @returns {Number}\n\t */\n\tpf.calcLength = function( sourceSizeValue ) {\n\n\t\tvar value = evalCSS(sourceSizeValue, true) || false;\n\t\tif (value < 0) {\n\t\t\tvalue = false;\n\t\t}\n\n\t\treturn value;\n\t};\n\n\t/**\n\t * Takes a type string and checks if its supported\n\t */\n\n\tpf.supportsType = function( type ) {\n\t\treturn ( type ) ? types[ type ] : true;\n\t};\n\n\t/**\n\t * Parses a sourceSize into mediaCondition (media) and sourceSizeValue (length)\n\t * @param sourceSizeStr\n\t * @returns {*}\n\t */\n\tpf.parseSize = memoize(function( sourceSizeStr ) {\n\t\tvar match = ( sourceSizeStr || \"\" ).match(regSize);\n\t\treturn {\n\t\t\tmedia: match && match[1],\n\t\t\tlength: match && match[2]\n\t\t};\n\t});\n\n\tpf.parseSet = function( set ) {\n\t\tif ( !set.cands ) {\n\t\t\tset.cands = parseSrcset(set.srcset, set);\n\t\t}\n\t\treturn set.cands;\n\t};\n\n\t/**\n\t * returns 1em in css px for html/body default size\n\t * function taken from respondjs\n\t * @returns {*|number}\n\t */\n\tpf.getEmValue = function() {\n\t\tvar body;\n\t\tif ( !eminpx && (body = document.body) ) {\n\t\t\tvar div = document.createElement( \"div\" ),\n\t\t\t\toriginalHTMLCSS = docElem.style.cssText,\n\t\t\t\toriginalBodyCSS = body.style.cssText;\n\n\t\t\tdiv.style.cssText = baseStyle;\n\n\t\t\t// 1em in a media query is the value of the default font size of the browser\n\t\t\t// reset docElem and body to ensure the correct value is returned\n\t\t\tdocElem.style.cssText = fsCss;\n\t\t\tbody.style.cssText = fsCss;\n\n\t\t\tbody.appendChild( div );\n\t\t\teminpx = div.offsetWidth;\n\t\t\tbody.removeChild( div );\n\n\t\t\t//also update eminpx before returning\n\t\t\teminpx = parseFloat( eminpx, 10 );\n\n\t\t\t// restore the original values\n\t\t\tdocElem.style.cssText = originalHTMLCSS;\n\t\t\tbody.style.cssText = originalBodyCSS;\n\n\t\t}\n\t\treturn eminpx || 16;\n\t};\n\n\t/**\n\t * Takes a string of sizes and returns the width in pixels as a number\n\t */\n\tpf.calcListLength = function( sourceSizeListStr ) {\n\t\t// Split up source size list, ie ( max-width: 30em ) 100%, ( max-width: 50em ) 50%, 33%\n\t\t//\n\t\t//                           or (min-width:30em) calc(30% - 15px)\n\t\tif ( !(sourceSizeListStr in sizeLengthCache) || cfg.uT ) {\n\t\t\tvar winningLength = pf.calcLength( parseSizes( sourceSizeListStr ) );\n\n\t\t\tsizeLengthCache[ sourceSizeListStr ] = !winningLength ? units.width : winningLength;\n\t\t}\n\n\t\treturn sizeLengthCache[ sourceSizeListStr ];\n\t};\n\n\t/**\n\t * Takes a candidate object with a srcset property in the form of url/\n\t * ex. \"images/pic-medium.png 1x, images/pic-medium-2x.png 2x\" or\n\t *     \"images/pic-medium.png 400w, images/pic-medium-2x.png 800w\" or\n\t *     \"images/pic-small.png\"\n\t * Get an array of image candidates in the form of\n\t *      {url: \"/foo/bar.png\", resolution: 1}\n\t * where resolution is http://dev.w3.org/csswg/css-values-3/#resolution-value\n\t * If sizes is specified, res is calculated\n\t */\n\tpf.setRes = function( set ) {\n\t\tvar candidates;\n\t\tif ( set ) {\n\n\t\t\tcandidates = pf.parseSet( set );\n\n\t\t\tfor ( var i = 0, len = candidates.length; i < len; i++ ) {\n\t\t\t\tsetResolution( candidates[ i ], set.sizes );\n\t\t\t}\n\t\t}\n\t\treturn candidates;\n\t};\n\n\tpf.setRes.res = setResolution;\n\n\tpf.applySetCandidate = function( candidates, img ) {\n\t\tif ( !candidates.length ) {return;}\n\t\tvar candidate,\n\t\t\ti,\n\t\t\tj,\n\t\t\tlength,\n\t\t\tbestCandidate,\n\t\t\tcurSrc,\n\t\t\tcurCan,\n\t\t\tcandidateSrc,\n\t\t\tabortCurSrc;\n\n\t\tvar imageData = img[ pf.ns ];\n\t\tvar dpr = pf.DPR;\n\n\t\tcurSrc = imageData.curSrc || img[curSrcProp];\n\n\t\tcurCan = imageData.curCan || setSrcToCur(img, curSrc, candidates[0].set);\n\n\t\t// if we have a current source, we might either become lazy or give this source some advantage\n\t\tif ( curCan && curCan.set === candidates[ 0 ].set ) {\n\n\t\t\t// if browser can abort image request and the image has a higher pixel density than needed\n\t\t\t// and this image isn't downloaded yet, we skip next part and try to save bandwidth\n\t\t\tabortCurSrc = (supportAbort && !img.complete && curCan.res - 0.1 > dpr);\n\n\t\t\tif ( !abortCurSrc ) {\n\t\t\t\tcurCan.cached = true;\n\n\t\t\t\t// if current candidate is \"best\", \"better\" or \"okay\",\n\t\t\t\t// set it to bestCandidate\n\t\t\t\tif ( curCan.res >= dpr ) {\n\t\t\t\t\tbestCandidate = curCan;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif ( !bestCandidate ) {\n\n\t\t\tcandidates.sort( ascendingSort );\n\n\t\t\tlength = candidates.length;\n\t\t\tbestCandidate = candidates[ length - 1 ];\n\n\t\t\tfor ( i = 0; i < length; i++ ) {\n\t\t\t\tcandidate = candidates[ i ];\n\t\t\t\tif ( candidate.res >= dpr ) {\n\t\t\t\t\tj = i - 1;\n\n\t\t\t\t\t// we have found the perfect candidate,\n\t\t\t\t\t// but let's improve this a little bit with some assumptions ;-)\n\t\t\t\t\tif (candidates[ j ] &&\n\t\t\t\t\t\t(abortCurSrc || curSrc !== pf.makeUrl( candidate.url )) &&\n\t\t\t\t\t\tchooseLowRes(candidates[ j ].res, candidate.res, dpr, candidates[ j ].cached)) {\n\n\t\t\t\t\t\tbestCandidate = candidates[ j ];\n\n\t\t\t\t\t} else {\n\t\t\t\t\t\tbestCandidate = candidate;\n\t\t\t\t\t}\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif ( bestCandidate ) {\n\n\t\t\tcandidateSrc = pf.makeUrl( bestCandidate.url );\n\n\t\t\timageData.curSrc = candidateSrc;\n\t\t\timageData.curCan = bestCandidate;\n\n\t\t\tif ( candidateSrc !== curSrc ) {\n\t\t\t\tpf.setSrc( img, bestCandidate );\n\t\t\t}\n\t\t\tpf.setSize( img );\n\t\t}\n\t};\n\n\tpf.setSrc = function( img, bestCandidate ) {\n\t\tvar origWidth;\n\t\timg.src = bestCandidate.url;\n\n\t\t// although this is a specific Safari issue, we don't want to take too much different code paths\n\t\tif ( bestCandidate.set.type === \"image/svg+xml\" ) {\n\t\t\torigWidth = img.style.width;\n\t\t\timg.style.width = (img.offsetWidth + 1) + \"px\";\n\n\t\t\t// next line only should trigger a repaint\n\t\t\t// if... is only done to trick dead code removal\n\t\t\tif ( img.offsetWidth + 1 ) {\n\t\t\t\timg.style.width = origWidth;\n\t\t\t}\n\t\t}\n\t};\n\n\tpf.getSet = function( img ) {\n\t\tvar i, set, supportsType;\n\t\tvar match = false;\n\t\tvar sets = img [ pf.ns ].sets;\n\n\t\tfor ( i = 0; i < sets.length && !match; i++ ) {\n\t\t\tset = sets[i];\n\n\t\t\tif ( !set.srcset || !pf.matchesMedia( set.media ) || !(supportsType = pf.supportsType( set.type )) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( supportsType === \"pending\" ) {\n\t\t\t\tset = supportsType;\n\t\t\t}\n\n\t\t\tmatch = set;\n\t\t\tbreak;\n\t\t}\n\n\t\treturn match;\n\t};\n\n\tpf.parseSets = function( element, parent, options ) {\n\t\tvar srcsetAttribute, imageSet, isWDescripor, srcsetParsed;\n\n\t\tvar hasPicture = parent && parent.nodeName.toUpperCase() === \"PICTURE\";\n\t\tvar imageData = element[ pf.ns ];\n\n\t\tif ( imageData.src === undefined || options.src ) {\n\t\t\timageData.src = getImgAttr.call( element, \"src\" );\n\t\t\tif ( imageData.src ) {\n\t\t\t\tsetImgAttr.call( element, srcAttr, imageData.src );\n\t\t\t} else {\n\t\t\t\tremoveImgAttr.call( element, srcAttr );\n\t\t\t}\n\t\t}\n\n\t\tif ( imageData.srcset === undefined || options.srcset || !pf.supSrcset || element.srcset ) {\n\t\t\tsrcsetAttribute = getImgAttr.call( element, \"srcset\" );\n\t\t\timageData.srcset = srcsetAttribute;\n\t\t\tsrcsetParsed = true;\n\t\t}\n\n\t\timageData.sets = [];\n\n\t\tif ( hasPicture ) {\n\t\t\timageData.pic = true;\n\t\t\tgetAllSourceElements( parent, imageData.sets );\n\t\t}\n\n\t\tif ( imageData.srcset ) {\n\t\t\timageSet = {\n\t\t\t\tsrcset: imageData.srcset,\n\t\t\t\tsizes: getImgAttr.call( element, \"sizes\" )\n\t\t\t};\n\n\t\t\timageData.sets.push( imageSet );\n\n\t\t\tisWDescripor = (alwaysCheckWDescriptor || imageData.src) && regWDesc.test(imageData.srcset || \"\");\n\n\t\t\t// add normal src as candidate, if source has no w descriptor\n\t\t\tif ( !isWDescripor && imageData.src && !getCandidateForSrc(imageData.src, imageSet) && !imageSet.has1x ) {\n\t\t\t\timageSet.srcset += \", \" + imageData.src;\n\t\t\t\timageSet.cands.push({\n\t\t\t\t\turl: imageData.src,\n\t\t\t\t\td: 1,\n\t\t\t\t\tset: imageSet\n\t\t\t\t});\n\t\t\t}\n\n\t\t} else if ( imageData.src ) {\n\t\t\timageData.sets.push( {\n\t\t\t\tsrcset: imageData.src,\n\t\t\t\tsizes: null\n\t\t\t} );\n\t\t}\n\n\t\timageData.curCan = null;\n\t\timageData.curSrc = undefined;\n\n\t\t// if img has picture or the srcset was removed or has a srcset and does not support srcset at all\n\t\t// or has a w descriptor (and does not support sizes) set support to false to evaluate\n\t\timageData.supported = !( hasPicture || ( imageSet && !pf.supSrcset ) || (isWDescripor && !pf.supSizes) );\n\n\t\tif ( srcsetParsed && pf.supSrcset && !imageData.supported ) {\n\t\t\tif ( srcsetAttribute ) {\n\t\t\t\tsetImgAttr.call( element, srcsetAttr, srcsetAttribute );\n\t\t\t\telement.srcset = \"\";\n\t\t\t} else {\n\t\t\t\tremoveImgAttr.call( element, srcsetAttr );\n\t\t\t}\n\t\t}\n\n\t\tif (imageData.supported && !imageData.srcset && ((!imageData.src && element.src) ||  element.src !== pf.makeUrl(imageData.src))) {\n\t\t\tif (imageData.src === null) {\n\t\t\t\telement.removeAttribute(\"src\");\n\t\t\t} else {\n\t\t\t\telement.src = imageData.src;\n\t\t\t}\n\t\t}\n\n\t\timageData.parsed = true;\n\t};\n\n\tpf.fillImg = function(element, options) {\n\t\tvar imageData;\n\t\tvar extreme = options.reselect || options.reevaluate;\n\n\t\t// expando for caching data on the img\n\t\tif ( !element[ pf.ns ] ) {\n\t\t\telement[ pf.ns ] = {};\n\t\t}\n\n\t\timageData = element[ pf.ns ];\n\n\t\t// if the element has already been evaluated, skip it\n\t\t// unless `options.reevaluate` is set to true ( this, for example,\n\t\t// is set to true when running `picturefill` on `resize` ).\n\t\tif ( !extreme && imageData.evaled === evalId ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !imageData.parsed || options.reevaluate ) {\n\t\t\tpf.parseSets( element, element.parentNode, options );\n\t\t}\n\n\t\tif ( !imageData.supported ) {\n\t\t\tapplyBestCandidate( element );\n\t\t} else {\n\t\t\timageData.evaled = evalId;\n\t\t}\n\t};\n\n\tpf.setupRun = function() {\n\t\tif ( !alreadyRun || isVwDirty || (DPR !== window.devicePixelRatio) ) {\n\t\t\tupdateMetrics();\n\t\t}\n\t};\n\n\t// If picture is supported, well, that's awesome.\n\tif ( pf.supPicture ) {\n\t\tpicturefill = noop;\n\t\tpf.fillImg = noop;\n\t} else {\n\n\t\t // Set up picture polyfill by polling the document\n\t\t(function() {\n\t\t\tvar isDomReady;\n\t\t\tvar regReady = window.attachEvent ? /d$|^c/ : /d$|^c|^i/;\n\n\t\t\tvar run = function() {\n\t\t\t\tvar readyState = document.readyState || \"\";\n\n\t\t\t\ttimerId = setTimeout(run, readyState === \"loading\" ? 200 :  999);\n\t\t\t\tif ( document.body ) {\n\t\t\t\t\tpf.fillImgs();\n\t\t\t\t\tisDomReady = isDomReady || regReady.test(readyState);\n\t\t\t\t\tif ( isDomReady ) {\n\t\t\t\t\t\tclearTimeout( timerId );\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t};\n\n\t\t\tvar timerId = setTimeout(run, document.body ? 9 : 99);\n\n\t\t\t// Also attach picturefill on resize and readystatechange\n\t\t\t// http://modernjavascript.blogspot.com/2013/08/building-better-debounce.html\n\t\t\tvar debounce = function(func, wait) {\n\t\t\t\tvar timeout, timestamp;\n\t\t\t\tvar later = function() {\n\t\t\t\t\tvar last = (new Date()) - timestamp;\n\n\t\t\t\t\tif (last < wait) {\n\t\t\t\t\t\ttimeout = setTimeout(later, wait - last);\n\t\t\t\t\t} else {\n\t\t\t\t\t\ttimeout = null;\n\t\t\t\t\t\tfunc();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\treturn function() {\n\t\t\t\t\ttimestamp = new Date();\n\n\t\t\t\t\tif (!timeout) {\n\t\t\t\t\t\ttimeout = setTimeout(later, wait);\n\t\t\t\t\t}\n\t\t\t\t};\n\t\t\t};\n\t\t\tvar lastClientWidth = docElem.clientHeight;\n\t\t\tvar onResize = function() {\n\t\t\t\tisVwDirty = Math.max(window.innerWidth || 0, docElem.clientWidth) !== units.width || docElem.clientHeight !== lastClientWidth;\n\t\t\t\tlastClientWidth = docElem.clientHeight;\n\t\t\t\tif ( isVwDirty ) {\n\t\t\t\t\tpf.fillImgs();\n\t\t\t\t}\n\t\t\t};\n\n\t\t\ton( window, \"resize\", debounce(onResize, 99 ) );\n\t\t\ton( document, \"readystatechange\", run );\n\t\t})();\n\t}\n\n\tpf.picturefill = picturefill;\n\t//use this internally for easy monkey patching/performance testing\n\tpf.fillImgs = picturefill;\n\tpf.teardownRun = noop;\n\n\t/* expose methods for testing */\n\tpicturefill._ = pf;\n\n\twindow.picturefillCFG = {\n\t\tpf: pf,\n\t\tpush: function(args) {\n\t\t\tvar name = args.shift();\n\t\t\tif (typeof pf[name] === \"function\") {\n\t\t\t\tpf[name].apply(pf, args);\n\t\t\t} else {\n\t\t\t\tcfg[name] = args[0];\n\t\t\t\tif (alreadyRun) {\n\t\t\t\t\tpf.fillImgs( { reselect: true } );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n\n\twhile (setOptions && setOptions.length) {\n\t\twindow.picturefillCFG.push(setOptions.shift());\n\t}\n\n\t/* expose picturefill */\n\twindow.picturefill = picturefill;\n\n\t/* expose picturefill */\n\tif ( typeof module === \"object\" && typeof module.exports === \"object\" ) {\n\t\t// CommonJS, just export\n\t\tmodule.exports = picturefill;\n\t} else if ( typeof define === \"function\" && define.amd ) {\n\t\t// AMD support\n\t\tdefine( \"picturefill\", function() { return picturefill; } );\n\t}\n\n\t// IE8 evals this sync, so it must be the last thing we do\n\tif ( !pf.supPicture ) {\n\t\ttypes[ \"image/webp\" ] = detectTypeSupport(\"image/webp\", \"data:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAAADABAJ0BKgEAAQADADQlpAADcAD++/1QAA==\" );\n\t}\n\n} )( window, document );\n"],"sourceRoot":"/source/"}