graphics/meta/graphics-svg.js

function(Y) {
    var DOCUMENT = Y.config.doc,
        useSVG = !Y.config.defaultGraphicEngine || Y.config.defaultGraphicEngine != "canvas",
        canvas = DOCUMENT && DOCUMENT.createElement("canvas"),
        svg = (DOCUMENT && DOCUMENT.implementation.hasFeature("http://www.w3.org/TR/SVG11/feature#BasicStructure", "1.1"));

    return svg && (useSVG || !canvas);
}