files/en-us/web/api/svgpatternelement/preserveaspectratio/index.md
{{APIRef("SVG")}}
The preserveAspectRatio read-only property of the {{domxref("SVGPatternElement")}} interface reflects the {{SVGAttr("preserveAspectRatio")}} attribute of the given element. It defines how the pattern's content should be scaled to fit the given space, preserving its aspect ratio.
An {{domxref("SVGAnimatedPreserveAspectRatio")}} object.
Given the following SVG, we can use the preserveAspectRatio property to retrieve the scaling behavior for the pattern element:
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200">
<defs>
<pattern
id="pattern1"
width="10"
height="10"
preserveAspectRatio="xMidYMid meet">
<circle cx="5" cy="5" r="5" fill="blue" />
</pattern>
</defs>
<rect x="0" y="0" width="100" height="100" fill="url(#pattern1)" />
</svg>
We can access the preserveAspectRatio attribute:
const pattern = document.querySelector("pattern");
console.log(pattern.preserveAspectRatio.baseVal); // output: SVGPreserveAspectRatio {align: 1, meetOrSlice: 1}
{{Specifications}}
{{Compat}}