How to replace a DomElement with a Textnode?

Similiar to this questen here:
```
<html>
   <body>
      Lorum ipsum <a href="http://google.com">click here</a> dolores lorem.
      Lorum ipsum <a href="http://stackoverflow.com">click here too</a> dolores lorem.
   </body>
</html>
```
to this:
```
<html>
    <body>
       Lorum ipsum click here dolores lorem.
       Lorum ipsum click here dolores lorem.
    </body>
</html>
```