I have a problem to add a `div` before `paragraph` element by given `clientHeight`. In this case, I want to get nearest `paragraph` from given `clientHeight` and add a `div` after/before that element.

Here the example:

```
<div id="content">
  <p>Paragraph 1</p>
  <p>Paragraph 2</p>
  <p>Paragraph 3</p>
  <p>Paragraph 4</p>
  <p>Paragraph 5</p>
</div>

```

I want to get the nearest `<p>` from `30px` clientHeight, then add a `div`.

How i can do that?