How to change SVG's path color?

Update: Yes, I know there are similar questions on SO, but the solutions don't work either.

I want to change SVG's color, I mean paths's color, not a color "inside" but the path itself.

I first tried with css, it did not work at all. Then with js, and it almost work:

This works, that is, an image is loaded. It's black by default.

<object id = 'test' data="images/icons/040__file_delete.svg" type="image/svg+xml"></object>

I want to change it to green.

    <script>
        $(function(){
            document.getElementById("test").addEventListener("load", function() {
                var doc = this.getSVGDocument();
                console.log(doc);//works fine
                var p = doc.querySelector("path"); //works
                p.setAttribute("stroke", "green");
            });    
        })
    </script>

The above does "work" but adds a "border" to the path. I also tried with "color", "fillcolor", "fill" - nothing works.

Update II: The SVG's source:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.0" id="图层_1" x="0px" y="0px" viewBox="0 0 18 18" style="enable-background:new 0 0 18 18;" xml:space="preserve">
<style type="text/css">
    .st0{fill:#231815;}
</style>
<g>
    <g>
        <g>
            <g>
                <g>
                    <path class="st0" d="M13,17.5H5c-1.4,0-2.5-1.1-2.5-2.5V3c0-1.4,1.1-2.5,2.5-2.5h3.6c0.4,0,0.8,0.2,1.1,0.4l5.4,5.4       c0.3,0.3,0.4,0.7,0.4,1.1V15C15.5,16.4,14.4,17.5,13,17.5z M5,1.5C4.2,1.5,3.5,2.2,3.5,3v12c0,0.8,0.7,1.5,1.5,1.5h8       c0.8,0,1.5-0.7,1.5-1.5V7.4c0-0.1-0.1-0.3-0.1-0.4L8.9,1.6C8.8,1.6,8.7,1.5,8.6,1.5H5z" fill="green"/>
                </g>
                <g>
                    <path class="st0" d="M15,7.5h-4C9.6,7.5,8.5,6.4,8.5,5V1c0-0.3,0.2-0.5,0.5-0.5S9.5,0.7,9.5,1v4c0,0.8,0.7,1.5,1.5,1.5h4       c0.3,0,0.5,0.2,0.5,0.5S15.3,7.5,15,7.5z"/>
                </g>
            </g>
            <g>
                <g>
                    <path class="st0" d="M10.5,13.9c-0.1,0-0.3,0-0.4-0.1l-3-3C7,10.5,7,10.2,7.1,10s0.5-0.2,0.7,0l3,3c0.2,0.2,0.2,0.5,0,0.7       C10.8,13.8,10.6,13.9,10.5,13.9z"/>
                </g>
                <g>
                    <path class="st0" d="M7.5,13.9c-0.1,0-0.3,0-0.4-0.1C7,13.5,7,13.2,7.1,13l3-3c0.2-0.2,0.5-0.2,0.7,0s0.2,0.5,0,0.7l-3,3       C7.8,13.8,7.6,13.9,7.5,13.9z"/>
                </g>
            </g>
        </g>
    </g>
</g>
</svg>

Solution

The fill and/or stroke attribute on the path(s) do not override the CSS styling (here's why).

What you need to do is override the CSS styling itself, this can be done by setting the style property, e.g.

<path style="fill:green" ...>

Or in javascript

element.setAttribute('style', 'fill: green');

In your response to my comment you mentioned you'd address the 'single path' issue, in order to provide an example for that too here's why and how to fix it.

The querySelector method only provides the first element (if any) that matches, you want to use the querySelectorAll method, which will provide a NodeList containing all matching elements.

var paths = doc.querySelectorAll("path"),
    i;

for (i = 0; i < paths.length: ++i) {
    paths[i].setAttribute('style', 'fill:green');
}

As I mentioned in my comment, the getSVGDocument() method may not exist on all browsers you need to support (I know nothing about your requirements, this is just a heads up), you may be interested in the .contentDocument property as described here