I'm using to fallback to default image if there is no concrete image for current item. This is working properly for firefox and even for IE8+ but chrome always display default image.
<object style="display: inline-block; width: 226px; height: 340px;" data-bind="attr: { data: ImageUrl }">
<img style="display: inline-block; width: 226px; height: 340px;" src="~/Content/images/default.png" />
</object>
to be honest I don't know even where to start searching for issue.