I have a rare demand:

I need the style "list-style:none" only when I have `<ol>` childs and no more tags.

Example, in this case I will apply the style:

```
<div>
  <ol><li>1</li></ol>
  <ol><li>2</li></ol>
</div>

```

In each other, I will disable the style:

```
 <div>
  <p>
  <ol><li>1</li></ol>
</div>

```

What is the best way? Thanks