In 10.1.2 Extended Code...
The first para says:
"Extended code is any any code..."
Delete one "any".
Also,
"... that contains occurances of ..."
Change "occurances" to "occurrences".
Also,
"...productions define subsequent to..."
Change "define" to "defined".
The last para says:
"The “strict code” includes both actual strict mode code ..."
After "The", insert "phrase"? "term"?
Append "and extended code"?
Also,
"while “extended code” islucco only used to to mean actual extended code."
Change "islucco" to "is".
Delete one "to"
corrected in editor's current draft
In the last para, you changed
“extended code” islucco only ...
to
“extended code” is designates only ...
but
is designates
should be
designates
or
is used to designate
corrected in working draft