Fix a potential skiplink bug in Safari
Fix a potential skiplink bug in Safari

This is written up at https://github.com/alphagov/govuk_template/blob/master/docs/usage.md ; Safari bug is https://bugs.webkit.org/show_bug.cgi?id=141113
alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend