Data IRIs in pint references.

Hi all

Since functional IRIs take an IRI reference, just the same as href does, is
there any particular reason you couldn't supply a paint server in the form
of a data IRI?

For example:

<rect width = "100" height = "100"
fill="url(data:image/svg+xml,%3ClinearGradient%20x1=%220%25%22%20y1=%2250%25%22%20x2=%22100%25%22%20y2=%2250%25%22%3E%3Cstop%20offset=%220%25%22%20style=%22stop-color:rgb(255,255,255);stop-opacity:1;%22%3E%3C/stop%3E%3Cstop%20offset=%22100%25%22%20style=%22stop-color:rgb(0,0,0);stop-opacity:1;%22%3E%3C/stop%3E%3C/linearGradient%3E)"></rect>


No browser I've tried supports this, but I'm curious if there is a
technical or other reason that proscribes it.

Paul