Unable to use HTML tags directly

[lbradley-mm]

If I add a HTML tag directly in content it gets parsed out (and errors on you demo site)
This works on the original parsedown demo though

The code I tested on demo sites is

Welcome to the demo:

1. Write Markdown text on the left
2. Hit the __Parse__ button or `⌘ + Enter`
3. See the result to on the right

<style>
ol {
margin: 0;
}
</style>