Add use_w3c capability for browser stack tests
Add use_w3c capability for browser stack tests

pascalchevrel/bedrock,craigcook/bedrock,pascalchevrel/bedrock,flodolo/bedrock,alexgibson/bedrock,MichaelKohler/bedrock,pascalchevrel/bedrock,MichaelKohler/bedrock,flodolo/bedrock,mozilla/bedrock,mozilla/bedrock,mozilla/bedrock,sylvestre/bedrock,flodolo/bedrock,craigcook/bedrock,MichaelKohler/bedrock,sylvestre/bedrock,sylvestre/bedrock,craigcook/bedrock,flodolo/bedrock,alexgibson/bedrock,alexgibson/bedrock,MichaelKohler/bedrock,pascalchevrel/bedrock,alexgibson/bedrock,craigcook/bedrock,sylvestre/bedrock,mozilla/bedrock