I have to correct myself. I just have made a little test and learned that firefox interprets data URI right while chrome blocks it.

Seems the feature was killed:

https://chromestatus.com/feature/5669602927312896

https://bugs.chromium.org/p/chromium/issues/detail?id=594215

I think it makes no sense to discuss this item further if one of the most widespread browser does not support it.

Regards,

Bernhard