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/ENCODE/dataMatrix/encodeDataMatrixInclude.html src/hg/htdocs/ENCODE/dataMatrix/encodeDataMatrixInclude.html
index 2c4b2b457f7..5f470277abd 100755
--- src/hg/htdocs/ENCODE/dataMatrix/encodeDataMatrixInclude.html
+++ src/hg/htdocs/ENCODE/dataMatrix/encodeDataMatrixInclude.html
@@ -50,31 +50,31 @@
 <strong>Experiment Summary</strong></a>
 page lists the number of experiments by assay type alone and may include annotations that are
 cell-type independent (annotations on the reference genome). 
 </p>
 
 <p>
 An ENCODE experiment is defined as a biochemical assay and follow-on data analyses performed on a
 single cell type by a single lab.  Data from an experiment is typically displayed in multiple
 browser tracks that offer different views of the data (e.g. enrichment signal graph, peak calls)
 and is available for download in multiple file formats (e.g. sequence alignments in BAM format, 
 signal graph in bigWig format) that support different analysis methods. 
 Data for multiple replicates are included in a single experiment.</p>
 <p>
 To display or download ENCODE data, select either the <em>tracks</em> or <em>files</em> option 
 in the
-<img style='border: 1px solid gray;' height='17' width='164' src='/images/encode/dataMatrixSearchPanel.png'>
+<img alt="ENCODE data matrix search panel" style='border: 1px solid gray;' height='17' width='164' src='/images/encode/dataMatrixSearchPanel.png'>
 panel, then click the appropriate box in the matrix grid (or row in the summary tables). 
 This will display a search window (via the UCSC <em>Track Search</em> or <em>File Search</em> 
 tool) that lists the full set of browser tracks or downloadable files for the selected experiments.
 This window also provides options to configure the browser view or refine the list of 
 downloadable files.</p>
 <p>
 These pages are best viewed in Firefox, Chrome, or Safari browsers.</p>
 
     <span id='dataMatrixXIcon' title='Click to hide help' class="xIcon">&times;</span>
     </div><!-- end content -->
     </div><!-- end helpText -->
 </div><!-- end wrapper -->
 
     <!-- a consider using caption tag, since colspan=0 doesn't work cross-browser -->
     <table id="matrixTable">