Update visually hidden class to fix ordering issue in VoiceOver OSX #1109
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I have investigated this and recorded the results in this gist: https://gist.github.com/nickcolley/19b80ed24d0364cfd3afd3b1b49c4014
We should update the govuk-visually-hidden class to remove the negative margin which will fix the ordering issue in VoiceOver for OSX.
We should recommend using aria-label or aria-labelledby where it makes sense to.
Visually hidden CSS can result in text not being read out when touching on iOS, this is regrettable but does not cause a hard barrier as users can explore the surrounding content to understand context.
Closes #1096