The attribute is meant to communicate to user agents and assistive technologies that the element has a description. If the referenced description is missing, it will be flagged as failure by any automated accessibility checker tool and, most importantly, is potentially confusing for assistive technologies users. Props afercia, joedolson, dinhtungdu, donmhico, SergeyBiryukov. Fixes #47975. Built from https://develop.svn.wordpress.org/trunk@46090 git-svn-id: http://core.svn.wordpress.org/trunk@45902 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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