Within an article-oriented page (such as a blog post), the element (level 1 heading) is commonly used to markup either:
There is a W3C Quality Assurance tip about this topic:
is the HTML element for the first-level heading of a document:
If the document is basically stand-alone, for example Things to See and Do in Geneva, the top-level heading is probably the same as the title.
If it is part of a collection, for example a section on Dogs in a collection of pages about pets, then the top level heading should assume a certain amount of context; just write
while the title should work in any context: Dogs - Your Guide to Pets.
Dogs