Defines how the background is repeated.
| NoRepeat | The background-image isn't repeated. The image is only shown once. This is the default to keep background compatibility with unity-background-scale-mode. |
| Space | The background-image is repeated as much as possible without clipping. The first and last image is pinned to either side of the element, and whitespace is distributed evenly between the images. |
| Round | The background-image is repeated and squished or stretched to fill the space (no gaps). |
| Repeat | The background image is repeated both vertically and horizontally. The last image will be clipped if it doesn't fit. |