SVG background in CSS without base64 encoding – Possible?

While working on a side project, I asked myself the interesting question if it would be possible to use SVG in CSS as a background image.
It is relatively simple if you use the SVG as an external file, but what if the object of the background is simple and I like to use it directly as an SVG is CSS.

SVG in CSS without base64

In the past, I always base64 encode the source of the SVG image, which is not needed.

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