What is HTML5
So at the start of this blog, the question was 'What is HTML5', simply put HTML5 has new containers that help search engines understand the structure of your web page, these new containers are very specific about their purpose and intent of the content it contains.
Some people say that HTML5 does not exist, in a way that is true. HTML has gone from HTML to HTML4 and then XHTML which was a nightmare before finally arriving at HTML5. But now the WHAT WG (Web Hypertext Application Technology Working Group) https://whatwg.org/ class HTML5 as a 'Living standard', this means that as new features are developed and added to the spec, browser manufactures then hopefully add these new features to their browser.