The dy read-only property of the SVGTextPositioningElement interface describes the y-axis coordinate of the SVGTextElement or SVGTSpanElement as an SVGAnimatedLengthList. It reflects the dy attribute's vertical displacement of the individual text glyphs in the user coordinate system.
The attribute value is a list of <length>, <percentage>, or <number>. The numeric values in the SVGAnimatedLengthList.baseVal reflect the vertical displacements in the user coordinate system.
Given the following SVG:
<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<text x="10" y="20" dy="5">Hello</text>
<text x="50" y="50" dy="10">World</text>
</svg>We can access the computed values of the dy attributes:
const texts = document.querySelectorAll("text");
console.log(texts[0].dy.baseVal[0].value); // output: 5
console.log(texts[1].dy.baseVal[0].value); // output: 10