Added some SVGs to the image source folder. gummy-bears-1 is 32750 characters when converted to a PNG data URI. gummy-bears-2 is 32826 characters, which is over IE8's limit of 32768, so it does not display.
Using URL references in PNG data URI stylesheet where the data URI would have been longer than 32768 characters, as this length data URI is not supported in IE8.