Implement nth-child(An+B of sel) and nth-last-child(An+B of sel) pseudo classes
Steps to reproduce the problem:
1. Open the testcase https://bugzilla.mozilla.org/attachment.cgi?id=8443862 in Edge.
What is the expected behavior?
The test should pass.
What went wrong?
The test failed, indicating that Edge does not support the relevant nth-child(An+B of sel) and nth-last-child(An+B of sel) pseudo classes.
Chrome Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=304163
Firefox Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=854148
Webkit Status: https://webkit.org/status/#feature-css-selector-:nth-child(an+b-of-selector-list)-and-:nth-last-child(an+b-of-selector-list)
Can I Use: http://caniuse.com/#feat=css-nth-child-of