Add punctuation to your alt text
To add a description to an image, author a string inside of an
altattribute declared on an
imgelement. Assistive technology will recognize the presence of the
altattribute and read the string as it moves through the page or view.
In addition to making sure your alt description is accurate, there’s one other thing you can do that makes for a good experience: ending your alt text string with punctuation.
I didn't know that, but it makes sense!