Various tests for semantics

annotation 1: Content MathML annotation error error

annotation 2: Content MathML\sin x + 5 error error

annotation 3: Content MathML error annotation error

annotation-xml 1: Content MathML application/mathml-presentation+xml error error

annotation-xml 2: Content MathML MathML-Presentation error error

annotation-xml 3: Content MathML
error error

annotation-xml 4: Content MathML
error error

annotation-xml 5: Content MathML
application/xhtml+xml

application/xhtml+xml

error error

annotation-xml 6: Content MathML
text/html

text/html

error error

annotation-xml 7: Content MathML error annotation-xml error