Title is required in head and can cause issues if its missing

[poi33]

If the metafields request processor gets a body without title in the head it will replace the first other title it finds anywhere.

If two titles are present in the head it will replace the first one only.
If no titles are present in the head it will replace the first other title it finds. (svg can use title, should use, its good accessiblity)

Related to #63

The difficult part of this is to get a reliable dom manipulation, but needs to be super fast.
We cant add time consuming operations on every single page load.