From 5a036343d39cc5da3b08c3f2fc1ff249983f7dab Mon Sep 17 00:00:00 2001
From: Maxim Baz <github@maximbaz.com>
Date: Sun, 14 Apr 2019 23:49:21 +0200
Subject: [PATCH] Use getAttribute to safely read attribute value (#110)

---
 src/inject.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/inject.js b/src/inject.js
index c9b3435..afe33ac 100644
--- a/src/inject.js
+++ b/src/inject.js
@@ -319,10 +319,11 @@
         // Try to filter only forms that have some identifying marker
         const markedForms = [];
         for (let form of forms) {
-            const props = [form.id, form.name, form.className, form.action];
+            const props = ["id", "name", "class", "action"];
             for (let marker of FORM_MARKERS) {
                 for (let prop of props) {
-                    if (prop.toLowerCase().indexOf(marker) > -1) {
+                    let propValue = form.getAttribute(prop) || "";
+                    if (propValue.toLowerCase().indexOf(marker) > -1) {
                         markedForms.push(form);
                     }
                 }