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We had a client come to us and let us know another vendor had notified them that many of the images on their site are missing alt tags / text. I know this was a big deal back in the day, but I haven't heard much about it lately. I am assuming if it doesn't even show up in the Moz site crawl, it must not be a big deal any more, but I would love to have more info about how important image alt tags are and if they are important, why Moz does not report them.