fixes #9836
grunt
Merge pull request #12983 from twbs/fat-9836

fixes #9836
document position relative firefox bug; cleanup some stuff in the browser bugs page
Merge branch 'master' into fat-12983

Conflicts:
	dist/js/bootstrap.min.js
	docs/assets/js/raw-files.min.js
	docs/dist/js/bootstrap.min.js
	test-infra/npm-shrinkwrap.canonical.json
Correct property order and class name in JS