HTML doesn't get properly parsed with multiple newlines present

[DaXcess]

For example, the string # Hello World\n\n<details>\n\n<summary>\n\nsummary</summary>\nDetails inner text</details>\n\n<p><b>\n\nI am in bold</b></p>**Okay?** results in the following:

While on GitHub it looks like:

---

Hello World

summary

Details inner text

I am in bold

Okay?

---

Quite a few markdown documents that I go through contain these multi-newline type HTML tags, which now seem to be breaking the layout quite a bit.