Replace <span ... /> with <span ...></span>

```js
const div = document.createElement('div')
div.innerHTML = '<span />After',
div.innerHTML
// -> "<span>After</span>"
```

demo/index.html

@@ -83,7 +83,7 @@
  <button id="attacker-stop" type="button">Stop</button>
 </div>
 
-<p><span id="dateNowStatus" /></p>
+<p><span id="dateNowStatus"></span></p>
 
 <h2>Sample Attacks:</h2>