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The flag of Heard & McDonald Islands (ハード島・マクドナルド諸島), HM, as an SVG string: viewBox 10080 by 5040 (2:1), 1.2 KB. The same picture as AU's. From Wikimedia Commons, "Flag of Australia (converted).svg" (public domain); the /manifest entry gives its author, licence and why it was chosen. It has a viewBox and no width or height, so it fills the box it is put in at its own aspect ratio.

import value from "@johnmorrisdotca/hata/flags/hm";

const svg: string = shared

import flag from "@johnmorrisdotca/hata/flags/hm";

const host=document.createElement("div");
host.innerHTML = flag; // or toDataUri(flag) from "@johnmorrisdotca/hata" for an <img src>
console.log(host.querySelector("svg")?.getAttribute("viewBox"));

import { svg } from "@johnmorrisdotca/hata/flags/hm";
console.log(svg.startsWith("<svg"),svg.length);

true 1215