Comment 5 for bug 616717

from the Scalable Vector Graphics (SVG) 1.1 specification:

5.7 The ‘image’ element:
«If attribute ‘preserveAspectRatio’ is not specified, then the effect is as if a value of xMidYMid meet were specified.»
<http://www.w3.org/TR/SVG11/struct.html#ImageElement>

5.8 The ‘preserveAspectRatio’ attribute:
«For ‘image’ elements, ‘preserveAspectRatio’ indicates how referenced images should be fitted with respect to the reference rectangle and whether the aspect ratio of the referenced image should be preserved with respect to the current user coordinate system.»
<http://www.w3.org/TR/SVG11/coords.html#PreserveAspectRatioAttribute>