Description
When developers use Frontity, the framework controls how the app is rendered (on both client and server).
This gives us the opportunity to render the whole <html> element with react and not just the <body> of the document.
Currently, Frontity is using react-helmet to manage the <head> of the document. This library comes with some extra bytes on top of the frontity framework (obviously) and it dynamically injects content into the <head> of the document outside of the React lifecycle.
Motivation
By creating our own <Head> component we could save some bytes from the Frontity bundle and manage the injection of elements into the <head> within pure react by leveraging React Context.
Examples
I have created a very simple demo of the concept: https://codesandbox.io/s/manage-document-head-with-pure-react-jz2hd
Yeah, we could create our own <Head> component and save the bytes of the code that react-helmet has to extract the content of the context for the HTML template because that would end up being rendered in React.
And maybe even have a way to pass strings and avoid having to parse them with Html2React (using dangeourslySetInnerHtml maybe?).
Good thing we are proxying react-helmet within a "frontity" import so we can do those types of things in the future without breaking backward compatibility 
I’ve been playing with this.
It seems like we cannot do <Fragment dangerouslySetInnerHTML={ { __html: HTML } } /> to add a string to the <head>.
I’ve been reading about this in the React repo:
There are a lot of people that want to do this, but it seems a bit stuck for now.
The only trick I found was to do:
<script
dangerouslySetInnerHTML={{
__html: `</script> <title>TEST</title> <script>`,
}}
/>
which is super clever because the inner HTML closes the script opened by React and then opens a new one for the closing tag, ending with this valid markup:
<script></script>
<title>TEST</title>
<script></script>
I tried in CodeSandbox (CRA) and it doesn’t work until you flush the head with: document.head.innerHTML = document.head.innerHTML;. I don’t know about SSR. I tried with Frontity and it didn’t work. I think react-helmet may be filtering it out.