Support Fabric in XML documents.

[ajvincent]

Fabric.js assumes that it runs inside a HTML document. Which is usually not a bad assumption, but it does mean if I try to load Fabric in a XML document, it just breaks all over the place. In particular, when referring to properties of element.style, it throws exceptions because element is an instance of Element, not HTMLElement. The latter has the style property; the former does not.

Fortunately the fix is simple: in HEADER.js, I use fabric.document = document.implementation.createHTMLDocument(""); to make this work (in the case where document isn't a HTMLDocument). I will provide a pull request momentarily.

I can provide a testcase upon request, written in SVG and using the <foreignObject> element. (I know, I know, why use FabricJS and Canvas if I have SVG? Well, I have my reasons - specifically, being able to capture a video stream in the browser from the canvas.) In general, though, I think the pull request I will generate will work with any XML document.

[ajvincent]

editor.zip
This has the SVG file and a FabricController.js, and assumes the existence of libraries/fabric/fabric.js .

In particular, it renders differently in Mozilla Firefox and Google Chrome: in Firefox there is a red dot above the canvas element. In Chrome, there isn't. That's more likely to be a browser behavior, though, not a Fabric bug.

[asturur]

i ll try the editor.zip, understand the use case and probably merge.

[ghost]

This breaks IE10 and IE9: both do not support HTMLDocument.
Now I have to go back to 2.6.0

[asturur]

ie9 is no more supported since 2.0
Ie10 there is a PR to restore functionality, if you would be able to test it, i can merge it.

[asturur]

#5678