Inline-HTML: Element-Attribute-ID is Not Rendered

When specifying inline-HTML in a markdown file (such as README.md):

<h2 id="bookmark">Bookmark</h2>

The HTML element attribute ID is not rendered as in the following example:

<h2>Bookmark</h2>

This is critical for creating a HTML anchor that references an element in the same document. Such as:

• [Bookmark](#bookmark)