"hljs-keyword">extends</span> <span class="hljs-title">HTMLElement</span> </span>{
        <span class="hljs-comment">// &#x30AB;&#x30B9;&#x30BF;&#x30E0;&#x30A8;&#x30EC;&#x30E1;&#x30F3;&#x30C4;&#x3092;&#x4F7F;&#x3046;&#x305F;&#x3081;&#x306B;&#x5FC5;&#x8981;&#x306A;&#x5B9A;&#x7FA9;&#x3067;&#x3059;</span>
        <span class="hljs-keyword">constructor</span>() { <span class="hljs-keyword">super</span>(); }
        connectedCallback() { <span class="hljs-keyword">this</span>.setTextContent(); }
        attribu