6c6
<   <li>Unclosed elements: If an element is <strong>not closed properly,
---
>   <li>Unclosed elements: If an element is <strong>not</strong> closed properly,
10,11c10,11
<       for code behaving correctly. <strong>strong <em>strong emphasised?</strong>
<       what is this?</em>
---
>       for code behaving correctly. <strong>strong <em>strong emphasised?</em></strong>
>       what is this?
14c14
<       look at an example: <a href="https://www.mozilla.org/>link to Mozilla
---
>       look at an example: <a href="https://www.mozilla.org/">link to Mozilla