Sectioning element choice for main content in HTML5 Bones
I think the section element should be an article element, and the two article elements should be section elements:

&lt;article&gt;

  &lt;h2&gt;Getting Started&lt;/h2&gt;

  &lt;section id="introduction"&gt;
    &lt;h3&gt;Introduction&lt;/h3&gt;
  &lt;/section&gt;

  &lt;section id="instructions"&gt;
    &lt;h3&gt;Instructions&lt;/h3&gt;
  &lt;/section&gt;

&lt;/article&gt;


While there are, of course, valid cases where a section element contains article elements, I think this not the case in this example.

The "Getting started" content is without question the main content for this document. The section element can be used for that purpose, but the article element would fit, too. A simple question to ask: Could this whole "Getting started" article be an entry in a feed? If yes, use article.

"Introduction" and "Instructions" are "sub-chapters" for "Getting started". Would it make sense to create separate entries for them in a feed? I don't think so.

However, as this document is meant as a boilerplate and therefor doesn't contain much content, it is hard to decide here. If "Introdcution" and "Instructions" would contain more content, so that these chapters could stand on their own, the current sectioning element choice would be correct.

But then there is the question: What would make more sense for the "typical site" the users of the HTML5 Bones template would create?

I guess you find more documents that need "article &gt; section" than "section &gt; article".

Examples:


a blog: only the front page and the tag pages need section &gt; article, but each blog entry needs article &gt; section.
an "About us" page on a company site: article &gt; section (or section &gt; section)
a shop: only the product listings need section &gt; article, but each product needs article &gt; section


Of course, a template can't make the choice for all users/sites. The users need to know what is right for their content. But I feel like it's dangerous to "default" to this sectioning element choice. If in doubt, one should use rather section than article, because section is what you get anyway (simply by using headings), while article has special meaning.