saveSVGtoBase64Png.js

const svgChartDom = document.getElementById("svg-element");
const svgSize = svgChartDom.getBoundingClientRect();
const svgChart = new XMLSerializer().serializeToString(svgChartDom);
let canvas = document.createElement("canvas");
canvas.width = svgSize.width;
canvas.height = svgSize.height;
let ctx = canvas.getContext("2d");
// Use canvg package to create canvas, resolve the limitation of IE, where drawing SVG would taint the canvas
let v = Canvg.fromString(ctx!, svgChart);
v.start();
v.ready().then(() => {
    const imageBase64 = canvas.toDataURL("image/png");
});