1 files changed, 31 insertions, 0 deletions
diff --git a/parser/htmlparser/tests/mochitest/browser_elementindtd.js b/parser/htmlparser/tests/mochitest/browser_elementindtd.js
new file mode 100644
index 0000000000..bc146ba73e
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/browser_elementindtd.js
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+ * https://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * Test for bug 1539759
+ * Loads a chrome XML document that has an exteernal DTD file with an entity
+ * that contains an element, and verifies that that element was not inserted
+ * into the document (but its content was).
+ */
+
+add_task(async function test() {
+  await BrowserTestUtils.withNewTab(
+    getRootDirectory(gTestPath) + "browser_elementindtd.xml",
+    async function (newBrowser) {
+      // NB: We load the chrome:// page in the parent process.
+      testNoElementFromEntity(newBrowser);
+    }
+  );
+});
+
+function testNoElementFromEntity(newBrowser) {
+  let doc = newBrowser.contentDocument;
+  is(doc.body.textContent, "From dtd", "Should load DTD.");
+  is(
+    doc.body.firstElementChild,
+    null,
+    "Shouldn't have an element inserted from the DTD"
+  );
+}