Function isUtf8Charset

Pagetual/pagetual.user.js:4251–4254

(label)

            return charsetMatch && charsetMatch[1] ? charsetMatch[1].trim() : "";
        }
        function isUtf8Charset(label) {
            let normalized = String(label || "").trim().toLowerCase().replace(/_/g, "-");
            return !normalized || normalized === "utf-8" || normalized === "utf8";
        }
        if (!f || !f.url || typeof fetch === "undefined") {
            if (onFetchError) {
                onFetchError({error: "Fetch not available"});