The valueAsString property of the SVGLength interface represents the <length>'s value as a string, in the units expressed by unitType.
Setting this attribute will cause value, valueInSpecifiedUnits, and unitType to be updated automatically to reflect this setting.
A string.
valueAsString// Create an SVGLength object
const svg = document.querySelector("svg");
const length = svg.createSVGLength();
// Set the length as a string
length.valueAsString = "45%";
console.log(length.valueAsString); // Output: "45%"
console.log(length.unitType); // Output: 2 (SVG_LENGTHTYPE_PERCENTAGE)
console.log(length.valueInSpecifiedUnits); // Output: 45
// Change the length value
length.valueAsString = "100px";
console.log(length.valueAsString); // Output: "100px"
console.log(length.unitType); // Output: 5 (SVG_LENGTHTYPE_PX)
console.log(length.value); // Output: 100