_html2canvas.Util.Support = function (options, doc) {

function supportSVGRendering() {

var img = new Image(),

canvas = doc.createElement("canvas"),

ctx = (canvas.getContext === undefined) ? false : canvas.getContext("2d");

if (ctx === false) {

return false;

}

canvas.width = canvas.height = 10;

img.src = [

"data:image/svg+xml,",

"<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10'>",

"<foreignObject width='10' height='10'>",

"<div xmlns='http://www.w3.org/1999/xhtml' style='width:10;height:10;'>",

"sup",

"</div>",

"</foreignObject>",

"</svg>"

].join("");

try {

ctx.drawImage(img, 0, 0);

canvas.toDataURL();

} catch(e) {

return false;

}

_html2canvas.Util.log('html2canvas: Parse: SVG powered rendering available');

return true;

}

// Test whether we can use ranges to measure bounding boxes

// Opera doesn't provide valid bounds.height/bottom even though it supports the method.

function supportRangeBounds() {

var r, testElement, rangeBounds, rangeHeight, support = false;

if (doc.createRange) {

r = doc.createRange();

if (r.getBoundingClientRect) {

testElement = doc.createElement('boundtest');

testElement.style.height = "123px";

testElement.style.display = "block";

doc.body.appendChild(testElement);

r.selectNode(testElement);

rangeBounds = r.getBoundingClientRect();

rangeHeight = rangeBounds.height;

if (rangeHeight === 123) {

support = true;

}

doc.body.removeChild(testElement);

}

}

return support;

}

return {

rangeBounds: supportRangeBounds(),

svgRendering: options.svgRendering && supportSVGRendering()

};

};