user button and menu accessiblity hidden span addition
courseware active location, suppress browser form validation, and progress graph accessibilit changes
required labels, active accordion item, move previous arrow to before unit sequence
revises the show/hide answer input to use an HTML button element for accessibility purposes
adds in aria attributes and semantic status content for textline problems
adds in aria attributes and semantic status content for annotation problems
adds in aria attributes and semantic status content for chem eq problems
adds in aria attributes and semantic status content for choicegroup  problems
adds in aria attributes and semantic status content for code input problems
adds in aria attributes and semantic status content for crystallography  problems
adds in aria attributes and semantic status content for drag and drop problems
adds in aria attributes and semantic status content for editagene problems
adds in aria attributes and semantic status content for editamolecule problems
adds in aria attributes and semantic status content for image input problems
adds in aria attributes and semantic status content for js-text input problems
adds in aria attributes and semantic status content for matlab problems
adds in aria attributes and semantic status content for designprotein2d problems
adds in aria attributes and semantic status content for option input problems
adds in aria attributes and semantic status content for schematic input problems
adds in aria attributes and semantic status content for vsepr input problems