When creating text for your alt attributes always add a full stop at the end of the text. This will help people who are using screen reading software to differentiate the image label from any surrounding text.
It is also a good idea to add a full stop to the end of each item in a list – helping to make the distinction between each item clearer for those who do not have any visual clues.
I provided feedback on the WCAG 2 (as representative of Guild of Accessible Website Designers) have two decades of experience and worked with hundreds of organisations.
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