When setting a background, you are given 3 options to set the background-size: contain, cover, custom. When using a repeating background, you need to set the background-size to custom and set the custom size to auto in order to get it to repeat. Any chance that auto could just be added to the dropdown list?
Additionally, when editing responsively, setting the background-size to custom does not show the input to type in the custom background size.
