diff --git a/after/syntax/css/speech-3.vim b/after/syntax/css/speech-3.vim
new file mode 100644
index 0000000..0de3014
--- /dev/null
+++ b/after/syntax/css/speech-3.vim
@@ -0,0 +1,6 @@
+syn match cssAuralProp contained "\<voice-\(volume\|balance\|rate\|pitch\|range\|stress\|duration\)\>"
+syn match cssAuralProp contained "\<rest\(-\(before\|after\)\)\=\>"
+syn keyword cssAuralAttr contained young old neutral preserve moderate reduced
+syn match cssAuralAttr contained "\<\(literal\|no\)-punctuation\>"
+syn match cssAuralAttr contained "\<\(x-\)\=\(weak\|strong\)\>"
+syn match cssValueNumber contained "[-+]\=\d\+\(dB\|st\)"
diff --git a/test/test.css b/test/test.css
index c243872..0a0d63b 100644
--- a/test/test.css
+++ b/test/test.css
@@ -851,6 +851,33 @@ mask {
   display: fit-content(10%);
 }
 
+.speech-3 {
+  voice-volume: auto;
+  voice-balance: auto;
+  rest-before: auto;
+  rest-after: auto;
+  rest: auto;
+  voice-rate: auto;
+  voice-pitch: auto;
+  voice-range: auto;
+  voice-stress: auto;
+  voice-duration: auto;
+  display: 10dB;
+  display: literal-punctuation;
+  display: no-punctuation;
+  display: x-weak;
+  display: weak;
+  display: strong;
+  display: x-strong;
+  display: young;
+  display: old;
+  display: neutral;
+  display: preserve;
+  display: 10st;
+  display: moderate;
+  display: reduced;
+}
+
 .style-attr {
   display: auto;
 }