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Short note on use of alt=”” and the title attribute | The Paciello Group – Your Accessibility Partner (WCAG 2.0/508 audits, VPAT, usability and accessible user experience)
Sometimes you have an image that is only presentational but included with an <img> element. In such cases, instead of not providing an alt-attribute at all (which causes screenreaders to assume an alternative text from the file name), you can add an empty alt="" attribute and screen readers will omit the element.