How to implement a javascript function in your browser so that it monitors certain parameters from the downloaded site (not a parser)?

Question

JavaScript

There is a loading site - the table is drawn and it can change every second.
I need to get the data value of a table.
I want to receive data values ​​through the built-in C# browser. That is, to inject javascript and that it would merge data into the main program.
Separately, I understood how to inject my javascript, but how to attach watch to the elements of the table (I know in which elements and classes the necessary data will sit) and that as soon as the value changes there, immediately notify the main program?
That is, you do not need a parser - the data changes every second.
Has anyone done similar?
Thanks

Answer 1

MutationObserver provides the ability to receive notifications about changes to certain DOM elements