Google uses this HTML code in its Adwords pt-BR page:
<section class="..." id="..."> <h4 class="..."> Preços </h4> <h2> Você paga somente pelos resultados. </h2> <h3> Quando não há acessos, não há cobrança. </h3> <p> ... </p> <h3> Comece com qualquer orçamento. </h3> <p> ... </p> </section>
Visually, it makes sense. But the problem, I think, is that they use
<h4> as section heading and
<h3>'s in the same
<section>, breaking the hierarchy of the page.
So, I want to know if this is a valid markup semantically speaking (and, if not, why does it matters). Also, how does this affect SEO?
Do I need to care about that?
PS: I've found this question but it didn't answer mine.