>&apos;month&apos;</span>);
            <span class="hljs-keyword">this</span>.textContent = localizeDate(lang, year, month);
        }
    }
);
</code></pre>
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<p>&#x4F55;&#x3088;&#x308A;&#x91CD;&#x8981;&#x306A;&#x3068;&#x3053;&#x308D;&#x306F;<code>attributeChangedCallback</code>&#x3068;<code>observedAttributes</code>&#x3067;&#x3059;