If no visible anchor text is present, the alt should convey the purpose of the link. For e.g <a href="http://www.unhcr.org/innovation/10-infographics-that-show-the-insane-scale-of-the-global-displacement-crisis"><img class="grow" src="refugeecrisis.jpg"></a> Should become <a href="http://www.unhcr.org/innovation/10-infographics-that-show-the-insane-scale-of-the-global-displacement-crisis"><img class="grow" src="refugeecrisis.jpg" alt="Photo showing refugees walking on a railway track"></a> You should include alt tags to your images to fix this. See: 1. https://dequeuniversity.com/guide/fireeyes/index-issues/issue-details?i=SC244LNK&v=5.2 2. https://github.com/GoogleChrome/accessibility-developer-tools/wiki/Audit-Rules#ax_text_04