Multiple H1s Shouldn’t be a Big Issue if You Are Using HTML5 Specification
As multiple H1 tags is a normal element found in HTML5, Google will try to take this into consideration and John doesn’t think it would be a huge problem. It’s more important for Google to be able to identify which parts of a page are primary content and which parts are more secondary.
Google Still Uses ‘Unavailable_After’ Tag
Google still uses and processes the ‘Unavailable_After’ meta tag, it hasn’t been deprecated.
Website Owners Don’t Need to Specify What Google Should & Shouldn’t Render
Website owners don’t need to implement anything on their sites that would tell Google what is unnecessary to render, as it should be Google’s job to figure this out. Being selective and not rendering particular elements can also cause problems for a website.
Use X-Robots-Tag HTTP Header to Noindex Indexed Sitemap Files
If sitemap files are indexed for normal search queries, then you can use the X-Robots-Tag HTTP header to noindex all pages ending in .xml or .gz.
Google Only Accepts Rel Alternate Links in Head Section
Google doesn’t accept rel alternate links returned in the response header, they are only accepted in the head section of a page.
Google Uses Semantic Markup to Understand Importance of Highlighted Text
Google can use semantic markup such as bold, italics and headings to understand that highlighted words are especially important.
Meta Tags Can be Combined in One Tag
Meta tags can be combined rather than having to have each one on its own separate line e.g. content=notranslate nositelinkssearchbox.
Google Sees No Difference Between HTTP Header and HTML Section
Google can process content in the HTTP header and the static HTMLsection at the same time so there’s no benefit from adding tags in one or the other. This has no effect on crawl budget, for example.