function decodeBase64WebPDataURL(url) {
            if (typeof url !== "string" || !url.match(/^data:image\/webp;base64,/i)) {
                return false;
            }
            
            return window.atob(url.substring("data:image\/webp;base64,".length));
        }
Decode a Base64 data URL into a binary string.

Returns the binary string, or false if the URL could not be decoded.