From 0109be64d62723fecf3ad66c7eee8858e8d004f7 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Tue, 31 Dec 2019 11:49:00 -0500
Subject: [PATCH] Fix LiteAdaptor's elementsByClass() function, and
 getElements().  Resolves issue mathjax/MathJax#2278.

---
 ts/adaptors/liteAdaptor.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/ts/adaptors/liteAdaptor.ts b/ts/adaptors/liteAdaptor.ts
index f6b89b43a..00e73c555 100644
--- a/ts/adaptors/liteAdaptor.ts
+++ b/ts/adaptors/liteAdaptor.ts
@@ -193,9 +193,9 @@ export class LiteAdaptor extends AbstractDOMAdaptor<LiteElement, LiteText, LiteD
         while (n) {
             if (n.kind !== '#text' && n.kind !== '#comment') {
                 n = n as LiteElement;
-                const classes = (n.attributes['class'] || '').split(/ /);
-                if (classes.find(name)) {
-                    let tags = [] as LiteElement[];
+                const classes = (n.attributes['class'] || '').trim().split(/ +/);
+                if (classes.includes(name)) {
+                    tags.push(n);
                 }
                 if (n.children.length) {
                     stack = n.children.concat(stack);
@@ -211,7 +211,7 @@ export class LiteAdaptor extends AbstractDOMAdaptor<LiteElement, LiteText, LiteD
      */
     public getElements(nodes: (string | LiteElement | LiteElement[])[], document: LiteDocument) {
         let containers = [] as LiteElement[];
-        const body = this.body(this.document);
+        const body = this.body(document);
         for (const node of nodes) {
             if (typeof(node) === 'string') {
                 if (node.charAt(0) === '#') {