diff --git a/index.html b/index.html
index 547167f..704e1a4 100644
--- a/index.html
+++ b/index.html
@@ -2316,6 +2316,12 @@ consider pick then apply, i.e changeColorLastId() but for next Id
 
 */
 
+jxrhighlight(){
+	[...document.querySelectorAll("[value]")]
+		.filter( el => (el.getAttribute("value").match(/^jxr /)))
+		.map( el => el.setAttribute("troika-text", {colorRanges: {0: 0x0099ff, 3: 0xffffff}}) )
+	// see also generalization via https://shiki.matsu.io custom renderers
+}
 
 </script>
 <div id="observablehq-key">