From 1c2529e4725147cd803b02fbd0d3a7903ce964cd Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Tue, 4 Nov 2025 08:51:04 -0500
Subject: [PATCH] Make sure tagName exists before using it.
 (mathjax/MathJax#3461)

---
 ts/a11y/explorer/KeyExplorer.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ts/a11y/explorer/KeyExplorer.ts b/ts/a11y/explorer/KeyExplorer.ts
index ef52735d6..33c1b9406 100644
--- a/ts/a11y/explorer/KeyExplorer.ts
+++ b/ts/a11y/explorer/KeyExplorer.ts
@@ -1461,6 +1461,7 @@ export class SpeechExplorer
         if (
           child !== this.speech &&
           child !== this.img &&
+          child.tagName &&
           child.tagName.toLowerCase() !== 'rect'
         ) {
           const { left, right, top, bottom } = child.getBoundingClientRect();