mobilizon.chapril.org-mobil.../js/src/utils/support.ts

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export function supportsWebPFormat(): boolean {
const elem = document.createElement("canvas");
if (elem.getContext && elem.getContext("2d")) {
// was able or not to get WebP representation
return elem.toDataURL("image/webp").indexOf("data:image/webp") === 0;
}
// very old browser like IE 8, canvas not supported
return false;
}