Markdown Previewer Test Nightmare

Here’s a link to my code

I’m failing test #4 : When I enter GitHub flavored markdown into the #editor element, the text is rendered as HTML in the #preview element as I type

With error : #preview’s only children should be those rendered by marked.js

Visually everything looks the same as the given example :

and upon inspecting the elements, both my code and the example return the same html within the #preview element, so what extra child am I rendering?