add role="button" to a[data-toggle="collapse"]
add role="button" to a[data-toggle="collapse"]

BS3 commits: d37bc2ae651a4fc2fd4ca477ab5bdfaeba5aafde

mozillo/todc-bootstrap,up2vs/todc-bootstrap,aaroncnhk/todc-bootstrap,ztx1491/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,2947721120/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap