alias: ref-height

Set height of the subelement relatively to the height of the element referenced to by the selector in ref attribute. If the value is in the [0, 1] interval (or expressed in percentages, e.g. '80%'), the height of the subelement will be set as a percentage of the height of the referenced element. If the value is <0 or >1, the height of the subelement will be smaller/bigger than the height of the referenced element by the amount specified. Note that this makes sense only for SVG elements that support width and height attributes, such as <rect>.