`y` CSS property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since January 2020.

The y CSS property defines the y-axis coordinate of the top left corner of the SVG <rect> shape, <image> image, <foreignObject> viewport and nested <svg> viewport relative to the nearest <svg> ancestor's user coordinate system. If present, it overrides the element's y attribute.

Note: The y property only applies to <rect>, <image>, <foreignObject>, and <svg> elements nested in an <svg>. It has no effect on outermost <svg> elements and does not apply to other SVG elements nor to HTML elements or pseudo-elements.

Syntax

/* length and percentage values */
y: 10px;
y: 10%;

/* Global values */
y: inherit;
y: initial;
y: revert;
y: revert-layer;
y: unset;

Values

The <length> and <percentage> values denote the y-axis coordinate position of the top left corner of the SVG element.

<length>: As an absolute or relative length, it can be expressed in any unit allowed by the CSS <length> data type.
<percentage>: Percentages refer to the height of the SVG viewBox, if declared, otherwise, the percentage refers to the height of the current SVG viewport.

Formal definition

Initial value	0
Applies to	`<svg>`, `<rect>`, `<image>`, and `<foreignObject>` elements in `<svg>`
Inherited	no
Percentages	refer to the height of the current SVG viewport
Computed value	the percentage as specified or the absolute length
Animation type	by computed value type

Formal syntax

y = 
  <length> |
  <percentage>

Examples

Defining the y-axis coordinates of SVG shapes

This example demonstrates the basic use case of y, and how the CSS y property takes precedence over the y attribute.

HTML

We include four identical SVG <rect> elements; their x and y attributes values are all 10, meaning the four rectangles are all in the same location, 10px from the top and left corner of the SVG viewport.

<svg>
  <rect width="40" height="40" x="10" y="10" />
  <rect width="40" height="40" x="10" y="10" />
  <rect width="40" height="40" x="10" y="10" />
  <rect width="40" height="40" x="10" y="10" />
</svg>

CSS

We style all the rectangles to have a black border and be slightly transparent, so overlapping rectangles are visible. We provide the rectangle with different fill and y values.

svg {
  border: 1px solid;
}

rect {
  fill: none;
  stroke: black;
  opacity: 0.8;
}

rect:nth-of-type(2) {
  y: -20px;
  fill: red;
}

rect:nth-of-type(3) {
  y: 4em;
  fill: yellow;
}

rect:nth-of-type(4) {
  y: 60%;
  fill: orange;
}

Results

The top edges of the rectangles are at 10 (from the attribute), -20px, 4em, and 60%, respectively. The rectangle is 40px tall, so the -20px places half the red rectangle outside the viewport. The SVG is 150px tall, so the orange rectangle's top side is 90px from the top of the SVG viewport.

Specifications

Specification
Scalable Vector Graphics (SVG) 2 # Y

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`y`	42	79	69	29	9	42	79	29	9	4.0	42	9