5709a7858d5c197721be66d5218a79124abadb70
lrnassar
  Tue Mar 17 08:46:31 2026 -0700
Adding alt text to images across static documentation pages, CGI headers, markdown docs, and Pandoc templates. Content images receive AI-generated descriptive alt text; decorative images (icons, spacers, toggles) receive alt="" per WCAG best practice. Also adds Image Descriptions section to the accessibility page, and fixes Pandoc Lua writers to output alt attributes. 67 files, covering help docs, news archive, ENCODE pages, portal pages, and session examples. refs #37254

diff --git src/hg/htdocs/ebolaPortal/index.html src/hg/htdocs/ebolaPortal/index.html
index adba39bdc3a..fa928b99404 100755
--- src/hg/htdocs/ebolaPortal/index.html
+++ src/hg/htdocs/ebolaPortal/index.html
@@ -37,48 +37,48 @@
 		Downloads for the Ebola genome in the UCSC Genome Browser can be found 
 		<a href="http://hgdownload.gi.ucsc.edu/downloads.html#ebola_virus" target="_blank">here</a>.
 		</p>
                 </div><!--end content-->
             
             </td>
             </tr>
             <!-- screenshot launchers 2x2 matrix -->
                 <tr>
 
                     <!-- Browser image linking to browser CGI -->
                     <td>
                     <div style="margin-top:0; margin-left:10px; margin-right:10px" class="wrapper">
                     <div class="bar"><h4 class="title">Explore the Ebola Genome with the UCSC Browser</h4></div>
                         <div class="content">
-                            <a href="../cgi-bin/hgTracks?db=eboVir3" target="_blank"><img class="screenshot" src="../images/ebolaBrowser.png"></a>
+                            <a href="../cgi-bin/hgTracks?db=eboVir3" target="_blank"><img class="screenshot" alt="UCSC Genome Browser displaying Ebola virus 2014 Sierra Leone assembly with sequence alignments" src="../images/ebolaBrowser.png"></a>
                         </div>
                     </div>
                     </td>
 
                     <!-- Incidence graph linked to CDC site -->
                     <td>
                     <div style="margin-top:0; margin-right: 10px;" class="wrapper">
                         <div class="bar"><h4 class="title">Learn about the 2014 outbreak</h4></div>
-                            <a href="http://www.cdc.gov/vhf/ebola/" target="_blank"><img class="screenshot"  src="../images/Graph_Diseased_Ebola_2014.png"></a>
+                            <a href="http://www.cdc.gov/vhf/ebola/" target="_blank"><img class="screenshot"  alt="Line graph of 2014 Ebola outbreak showing rise in cases and deaths from April to September" src="../images/Graph_Diseased_Ebola_2014.png"></a>
                     </div>
                     </td>
 
                     <!-- Viral structure cartoon and launcher from ViralZone -->
                     <td>
                     <div style="margin-top:0;" class="wrapper">
                         <div class="bar"><h4 class="title">Read about Ebola</h4></div>
-                            <a href="http://viralzone.expasy.org/all_by_species/207.html" target="_blank"><img class="screenshot" src="../images/Filovirus_virion_small.png"></a>
+                            <a href="http://viralzone.expasy.org/all_by_species/207.html" target="_blank"><img class="screenshot" alt="Diagram of a filovirus virion showing glycoprotein, matrix, nucleoprotein, and polymerase components" src="../images/Filovirus_virion_small.png"></a>
                     </div>
                     </td>
                 </tr>
 
 <!-- Publications block -->
             <tr>
             <td colspan="3">
             <div style="margin-top: 15px; margin-left: 10px;" class="wrapper">
             <div class="bar"><h4 class="title">Related Publications and Data Resources</h4></div>
             <div class="content">
                 <p>
                 NCBI sequence database search, publication list, and genome display:
                 <a href="https://www.ncbi.nlm.nih.gov/genome/viruses/variation/ebola/" target="_blank"</a>NCBI Virus Variation Ebolavirus Resource</a>
 		</p>
 		</p>