diff --git a/lib/LaTeXML/Package/acmart.cls.ltxml b/lib/LaTeXML/Package/acmart.cls.ltxml
index b94e303f8..da90118c4 100644
--- a/lib/LaTeXML/Package/acmart.cls.ltxml
+++ b/lib/LaTeXML/Package/acmart.cls.ltxml
@@ -73,16 +73,18 @@ DefMacro('\subtitle{}', '\@add@frontmatter{ltx:subtitle}{#1}');
DefMacro('\keywords{}', '\@add@frontmatter{ltx:keywords}{#1}');
DefMacro('\terms{}', '\@add@frontmatter{ltx:keywords}{#1}');
-# Accessible figure descriptions
-NewCounter('acmlabel');
-DefConstructor('\Description[]{}', '^^#1',
- properties => sub { ('width' => Dimension(0), 'height' => Dimension(0), RefStepCounter('acmlabel')) },
- beforeConstruct => sub {
- my ($document, $whatsit) = @_;
- # TODO: Is there something useful to do with the short description in our schema?
- my $figure = $document->getElement;
- $document->setAttribute($figure, 'aria:labelledby', $whatsit->getProperty('id'));
- return; });
+# Accessible figures: \Description[alternate text]{long descriptions}
+DefConstructor('\Description[]{}', sub {
+ my ($document, $alt, $desc) = @_;
+ # Could this apply to other than figure?
+ if (my $savenode = $document->floatToElement('ltx:figure')) {
+ $document->insertElement('ltx:alternate-text', $alt) if defined $alt;
+ $document->insertElement('ltx:long-description', $desc) if defined $desc;
+ $document->setNode($savenode); }
+ else {
+ Warn('expected','figure',$document, "No figure was found for the \\Description"); }
+ return; },
+ sizer => 0);
# Use multiple style, repeating \author, \orcid, \affiliation, \email as needed.
DefConstructor('\@@@affiliation{}', "^ #1");
diff --git a/lib/LaTeXML/resources/CSS/LaTeXML.css b/lib/LaTeXML/resources/CSS/LaTeXML.css
index 54f8319ee..8ac694514 100644
--- a/lib/LaTeXML/resources/CSS/LaTeXML.css
+++ b/lib/LaTeXML/resources/CSS/LaTeXML.css
@@ -436,6 +436,9 @@ span.ltx_framed { display:inline-block; text-indent:0; } /* avoid padding/
.ltx_missing { color:red;}
.ltx_nounicode { color:red; }
.ltx_nodisplay { display:none; }
+.ltx_alternate-text,
+.ltx_long-description
+ { display:none; }
/*======================================================================
SVG (pgf/tikz & xy) basics
*/
@@ -604,4 +607,4 @@ cite { font-style: normal; }
[style*="--ltx-stroke-color:"] {
stroke: var(--fn-stroke-color-to-dark-mode);
}
-}
\ No newline at end of file
+}
diff --git a/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rnc b/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rnc
index b5bf07b27..d11577a67 100644
--- a/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rnc
+++ b/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rnc
@@ -14,7 +14,9 @@ default namespace = "http://dlmf.nist.gov/LaTeXML"
## Meta elements are generally hidden;
## they can appear in both inline and block contexts.
-Meta.class |= note | declare | indexmark | glossarydefinition | rdf | resource | navigation
+Meta.class |= note | declare | indexmark | glossarydefinition
+ | rdf | resource | navigation
+ | alternate-text | long-description
#======================================================================
@@ -172,6 +174,35 @@ rdf_attributes =
## Content model for \elementref{rdf}
rdf_model = Flow.model
+#======================================================================
+# Descriptions & Accessibilty
+
+alternate-text =
+## A container for alternative or replacement text for another element (the parent);
+## This would typically be used when the parent cannot or should not be rendered;
+## for example, spoken by screen readers as a replacement for images.
+element alternate-text { alternate-text_attributes, alternate-text_model }
+
+## Attributes for \elementref{alternate-text}
+alternate-text_attributes = empty
+
+## Content for \elementref{alternate-text}
+alternate-text_model = Flow.model
+
+long-description =
+## A container for a detailed description of another element (the parent);
+## This would typically be used to describe the actual contents of
+## a figure or image, as distinct from a caption which may only describe its
+## source or purpose.
+element long-description { long-description_attributes, long-description_model }
+
+## Attributes for \elementref{long-description}
+long-description_attributes = empty
+
+## Content for \elementref{long-description}
+long-description_model = Flow.model
+
+
#======================================================================
# Document-level (or sub-document level) Meta objects
diff --git a/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rng b/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rng
index 0da5d368b..36fe31e5d 100644
--- a/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rng
+++ b/lib/LaTeXML/resources/RelaxNG/LaTeXML-meta.rng
@@ -24,6 +24,8 @@ they can appear in both inline and block contexts.
![]()
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diff --git a/lib/LaTeXML/resources/XSLT/LaTeXML-meta-xhtml.xsl b/lib/LaTeXML/resources/XSLT/LaTeXML-meta-xhtml.xsl
index 5a5df8b06..5e7290d39 100644
--- a/lib/LaTeXML/resources/XSLT/LaTeXML-meta-xhtml.xsl
+++ b/lib/LaTeXML/resources/XSLT/LaTeXML-meta-xhtml.xsl
@@ -17,6 +17,7 @@
xmlns:xsl = "http://www.w3.org/1999/XSL/Transform"
xmlns:ltx = "http://dlmf.nist.gov/LaTeXML"
xmlns:f = "http://dlmf.nist.gov/LaTeXML/functions"
+ xmlns:aria = "http://www.w3.org/ns/wai-aria"
extension-element-prefixes="f"
exclude-result-prefixes = "ltx f">
@@ -147,4 +148,68 @@
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diff --git a/lib/LaTeXML/resources/XSLT/LaTeXML-misc-xhtml.xsl b/lib/LaTeXML/resources/XSLT/LaTeXML-misc-xhtml.xsl
index 36345a7a5..99cbedb0c 100644
--- a/lib/LaTeXML/resources/XSLT/LaTeXML-misc-xhtml.xsl
+++ b/lib/LaTeXML/resources/XSLT/LaTeXML-misc-xhtml.xsl
@@ -185,6 +185,11 @@
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