The sentences in the key to the map have 2 forms:
1. the visual form, with an graphic pattern
alongside text saying what the pattern means
in the map
2. the semantic form, with text describing what
the pattern means and how big an area it covers
for this alert
This is achieved by making the graphic
non-semantic and having hidden words in the
sentence for each paragraph.
While the spaces between words are correct for
both forms of these sentences, we observed screen
readers speaking some groups of words as one when
they spoke the sentence. Most noticably, 'the
alert' was spoken as 'thealert'.
Swapping the class used to hide the visually
hidden words from ours to the GOVUK one seemed to
fix this. It's unclear why it does but the
`govuk-visually-hidden` class adds the following
styles to those in ours:
- width: 1px
- height: 1px
- white-space: nowrap
It also has `margin: 0` instead of `margin: -1px`.
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