Add tags for displaying document amendments

[andymcaleer]

We've come across a user need to display, on GOV.UK guidance pages, additions and deletions in HTML versions of legal documents. We've not been able to find a way to do this. We can in PDFs though. For example, the Digital Marketplace has published this 'contract variation':

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/558098/g-cloud-8-contract-variation-05-10-2016.pdf

In this PDF, it's obvious to sighted users what's changed (the green/red+strikeout coding is clear). The doc is probably accessible too as we believe the amendments are distinguished by screen-readers.

However, govspeak currently doesn't let us use colour in the same way for HTML. It does allow us to use the del and u tags but they're not as clear. Can we add govspeak support for these specific uses of color? Are there any other markup-related recommendations to meet these user needs?

Thanks!

Andy McAleer, content designer in GDS