refY

The refY attribute defines the y coordinate of an element’s reference point.

You can use this attribute with the following SVG elements:

marker

For <marker>, refY defines the y coordinate of the marker’s reference point, which is to be placed exactly at the marker’s position on the shape.

Value	`<length-percentage>` \| `<number>` \| `top` \| `center` \| `bottom`
Default value	`0`
Animatable	Yes

<length-percentage>

Lengths are interpreted as being in the coordinate system of the marker contents, after application of the viewBox and preserveAspectRatio attributes.

Percentage values are interpreted as being a percentage of the viewBox height.

<number>

Numbers are interpreted as being in the coordinate system of the marker contents, after application of the viewBox and preserveAspectRatio attributes.

top

The reference point of the marker is placed at the top edge of the shape.

center

The reference point of the marker is placed at the vertical center of the shape.

bottom

The reference point of the marker is placed at the bottom edge of the shape.

symbol

For <symbol>, refY defines the y coordinate of the symbol, which is defined by the cumulative effect of the y attribute and any transformations on the <symbol> and its host <use> element.

Unlike other positioning attributes, refY is interpreted as being in the coordinate system of the symbol contents, after application of the viewBox and preserveAspectRatio attributes. If the attribute is not specified, no vertical adjustment is made, and the top side of the symbol’s rectangular viewport region (regardless of the viewBox coordinate) is positioned at the y coordinate.

Note: For backwards compatibility, the behavior when refY is not specified on a <symbol> element is different from when it is specified with a value of 0, and therefore different from the behavior when an equivalent attribute is not specified on a <marker> element.

Value	`<length>` \| `top` \| `center` \| `bottom`
Default value	None
Animatable	Yes