In addition to the older <h1>, <h2>, <h3>, <h4>, <h5>, and <h6> elements, I would like to see two new generic heading elements <h> (heading) and <sh> (subheading) to be available. These two elements would be sufficient to represent the most common usage of a heading and subheading in a section. You rarely see or have a need for a heading with any lower ranking of <h1> or <h2> since by using <section> elements you are able to have headings with a lower ranking in a sub-section. Otherwise you would end up needing elements of <h7>, <h8>, <h9>..... going on forever. These older numbered heading elements could still be supported, but they would eventually become obsolete in favor of using generic <h> and <sh> elements.

<section>
    <h>Heading</h>
    <sh>Sub Heading</sh>
    <p>Paragraph</p>
    <section>
        <h>Heading</h>
        <sh>Sub Heading</sh>
        <p>Paragraph</p>
    </section>
</section>