alias: ref-width

Set width of the subelement relatively to the width 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 width of the subelement will be set as a percentage of the width of the referenced element. If the value is <0 or >1, the width of the subelement will be smaller/bigger than the width of the referenced element by the amount specified. For example, 'ref-width': .75 sets the width of the subelement to 75% of the width of the referenced element. 'ref-width': 20 makes the width to be 20px less than the width of the referenced element. Note that this makes sense only for SVG elements that support width and height attributes, such as <rect>.