diff --git a/css-forms-1/Overview.bs b/css-forms-1/Overview.bs
index 6b3c18ea2c2..d37b0904baf 100644
--- a/css-forms-1/Overview.bs
+++ b/css-forms-1/Overview.bs
@@ -843,8 +843,14 @@ ISSUE: Refine meter, progress, switch and range input styling.
 
 ```css
 input:is([type=checkbox]:not([switch]), [type=radio]) {
-    width: 1em;
-    height: 1em;
+    /* These size rules ensure accessibility by following WCAG rules:
+    * https://www.w3.org/WAI/WCAG22/Understanding/target-size-minimum.html */
+    block-size: max(1em, 24px);
+    inline-size: max(1em, 24px);
+
+    /* This font-size rule ensures the checkmark fills the containing box. */
+    font-size: max(1em, 24px);
+
     display: inline-flex;
     align-items: center;
     justify-content: center;