The value property of the SVGLength interface represents the floating point value of the <length> in user units.
Setting this attribute will cause SVGLength.valueInSpecifiedUnits and SVGLength.valueAsString to be updated automatically to reflect this setting.
The length value in user units as a float.
// Get an SVGLength object
const svg = document.querySelector("svg");
const length = svg.createSVGLength();
// Set the value
length.value = 10;
console.log(length.value); // Output: 10
// Reflecting the value
length.value = 20;
console.log(length.value); // Output: 20