Turn off anti-aliasing on svg when applying CSS3:Zoom on the element?

Question

I found that when the CSS3 Zoom is applied on small SVG icons (9px:9px with zoom: 1.5), the SVG icons could be blurry. Any idea to get a sharp and clean icon in this case? Thanks in advance.

The SVG:

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve"
         x="0px" y="0px" width="9px" height="9px" viewBox="0 0 9 9" enable-background="new 0 0 9 9">
    <g>
        <g fill="none" transform="translate(0.5, 0.5)"> 
            <g stroke="#000000" stroke-width="0.5" stroke-linecap="square" >
                <line x1="2" y1="4"  x2="6" y2="4"/>
                <line x1="4"  y1="2" x2="4" y2="6"/>
            </g>
            <g stroke="#909090" stroke-width="1" stroke-linecap="square" >
                <rect x="0" y="0" width="8" height="8"/>
            </g>
        </g>
    </g>
</svg>

Answer 1

Got a solution myself. The trick is adding:

shape-rendering="crispEdges"

to the SVG elements.

From Mozilla MDN:

crispEdges Indicates that the user agent shall attempt to emphasize the contrast between clean edges of artwork over rendering speed and geometric precision. To achieve crisp edges, the user agent might turn off anti-aliasing for all lines and curves or possibly just for straight lines which are close to vertical or horizontal. Also, the user agent might adjust line positions and line widths to align edges with device pixels.

See the difference on jsFilddle.