incresing audience to 4%
Refactor icon-button mixin
correct audience
Coding conventions: use double quotes for HTML attributes
Removed duplicated root for tag combiners
Remove defer script test
Merge pull request #3539 from guardian/remove-defer-test

Remove defer script test
Merge pull request #3537 from guardian/icon-button-refactor

Refactor icon-button mixin
Merge branch 'master' of github.com:guardian/frontend into 404