Header tags should be considered block elements

[onhate]

I would expect the outcome of the following html snippet when invoking structuredText to be content inside html but instead I'm getting content insidehtml

<p>content</p><span><u><h1>inside</h1><i>htm<u>l</u></i></u></span>

According to what is rendered as html it was supposed to have an extra space on the header element, correct?

https://developer.mozilla.org/en-US/docs/Web/HTML/Block-level_elements

<h1>, <h2>, <h3>, <h4>, <h5>, <h6>
Heading levels 1-6.

HTMLParser.parse("<p>content</p><span><u><h1>inside</h1><i>htm<u>l</u></i></u></span>").structuredText;