What happens when an element is being processed in forwards-compatible mode? - XSLT

What happens when an element is being processed in forwards-compatible mode?

- The top-level element written in XSLT 1.0 doesn’t allow the elements to be taken as the top-level elements and it can be ignored with its content.

- The element is being dependent on the template and then XSLT takes the decision in allowing or not allowing the elements in the templates to occur.

- If the element is not being instantiated then the error is logged in and it is sent for further processing.

- The element gets instantiated after that only XSLT performs the fallback for the element specified in the procedure.

- If the element provides the attribute using the XSLT then the element is not allowed to have an optional attribute.