fixes #8
fixes #8

# Added a mention for MathML's maction

togusafish/t-ashula-_-DOMPurify,tdeekens/DOMPurify,kwangkim/DOMPurify,neilj/DOMPurify,tdeekens/DOMPurify,ConradIrwin/DOMPurify,voku/DOMPurify,voku/DOMPurify,ConradIrwin/DOMPurify,tdeekens/DOMPurify,neilj/DOMPurify,Joris-van-der-Wel/DOMPurify,neilj/DOMPurify,togusafish/t-ashula-_-DOMPurify,Joris-van-der-Wel/DOMPurify,kwangkim/DOMPurify,Joris-van-der-Wel/DOMPurify