I have several hundreds of pages with good SERPs. I have a requirement to add a common sub section (kind of note) with a single heading and and a couple of lines beneath the heading. I will be using a h3 tag for the sub heading. However, this sub section makes sense when added below navigation menu and above the h1 tag (page title) in all pages. Does adding a h2 or h3 tag above h1 tag have a negative impact on SEO?
The layout would go like this once implemented
Site name Navigation Menu <h3>sub section header</h3> <p>...</p> <h1>page title</h1> Content
Note: The sub section will be a common one across the pages.