<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">></span></span>It has been <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>counter<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">></span></span> seconds since you loaded this page<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
            <span class="token keyword">let</span> timeSinceLoad <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
            <span class="token keyword">const</span> counterSpan <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"counter"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            
            <span class="token keyword">function</span> <span class="token function">updateTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                timeSinceLoad <span class="token operator">+=</span> <span class="token number">1</span><span class="token punctuation">;</span>
                counterSpan<span class="token punctuation">.</span>innerText <span class="token operator">=</span> timeSinceLoad<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token function">setInterval</span><span class="token punctuation">(</span>updateTime<span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">></span></span>