Need detailed information about parsing of special tags

[dSalieri]

You have the following sentence:

Support for parsing inline SVG and MathML in HTML was added in April 2008. There are both similarities and differences to the XML syntax.

That link is very interesting, I followed by it and found the next:

Namespace boundaries exist on the following elements: <math> <mo> <mi> <ms> <mn> <mtext>

What does it mean?

Also I'm reading spec and it's unclear in

A node is a MathML text integration point if it is one of the following elements:

• A MathML mi element
• A MathML mo element
• A MathML mn element
• A MathML ms element
• A MathML mtext element

Why exactly this set of math tags?

Or more specific case in html spec

The stack of open elements is said to have a particular element in scope when it has that element in the specific scope consisting of the following element types:

• applet
• caption
• html
• table
• td
• th
• marquee
• object
• template
• MathML mi
• MathML mo
• MathML mn
• MathML ms
• MathML mtext
• MathML annotation-xml
• SVG foreignObject
• SVG desc
• SVG title

There is no information about sets, why they are the way they are.

Thanks for your attention.