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index.md
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index.md
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---
title: refY
slug: Web/SVG/Attribute/refY
page-type: svg-attribute
spec-urls:
- https://svgwg.org/svg2-draft/painting.html#MarkerElementRefYAttribute
- https://svgwg.org/svg2-draft/struct.html#SymbolElementRefYAttribute
---
{{SVGRef}}
The **`refY`** attribute defines the y coordinate of an element's reference point.
You can use this attribute with the following SVG elements:
- {{SVGElement("marker")}}
- {{SVGElement("symbol")}}
## marker
For {{SVGElement("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.
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>
{{cssxref("length-percentage")}} |
{{cssxref("number")}} | <code>top</code> | <code>center</code> |
<code>bottom</code>
</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>0</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
- `<length-percentage>`
- : Lengths are interpreted as being in the coordinate system of the marker contents, after application of the {{SVGAttr("viewBox")}} and {{SVGAttr("preserveAspectRatio")}} attributes.
Percentage values are interpreted as being a percentage of the {{SVGAttr("viewBox")}} height.
- `<number>`
- : Numbers are interpreted as being in the coordinate system of the marker contents, after application of the {{SVGAttr("viewBox")}} and {{SVGAttr("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 {{SVGElement("symbol")}}, `refY` defines the y coordinate of the symbol, which is defined by the cumulative effect of the {{SVGAttr("y")}} attribute and any transformations on the {{SVGElement("symbol")}} and its host {{SVGElement("use")}} element.
Unlike other positioning attributes, `refY` is interpreted as being in the coordinate system of the symbol contents, after application of the {{SVGAttr("viewBox")}} and {{SVGAttr("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 {{SVGElement("marker")}} element.
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>
{{cssxref("length")}} | <code>top</code> | <code>center</code> |
<code>bottom</code>
</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td>None</td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
- `<length-percentage>`
- : Lengths are interpreted as being in the coordinate system of the marker contents, after application of the {{SVGAttr("viewBox")}} and {{SVGAttr("preserveAspectRatio")}} attributes.
Percentage values are interpreted as being a percentage of the {{SVGAttr("viewBox")}} height.
- `<number>`
- : Numbers are interpreted as being in the coordinate system of the marker contents, after application of the {{SVGAttr("viewBox")}} and {{SVGAttr("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.
## Specifications
{{Specifications}}
## See also
- {{SVGAttr("refX")}}