Yostivanich

We already have an ele­ment for com­ments and other self-contained doc­u­ment mod­ules, namely, <arti­cle>. The spec in fact specif­i­cally calls out an <arti­cle> nested in another <arti­cle> as being, by def­i­n­i­tion, a com­ment <arti­cle> on the outer <article>

via whatwg – Requests for new ele­ments for com­ments. Want to do com­ments on your new spiffy HTML5 site, use an arti­cle ele­ment inside your main arti­cle element.