diff --git a/regression_testing/cases/github-cases/case-839@1.html b/regression_testing/cases/github-cases/case-839@1.html
new file mode 100755
index 0000000..0f962c8
--- /dev/null
+++ b/regression_testing/cases/github-cases/case-839@1.html
@@ -0,0 +1,12 @@
+<!--
+This test case represents HTML Tidy issue #839, which describes
+a descrepancy between tidy's behavior and the W3C Nu HTML
+checker behavior. Tidy has historically allowed empty <title>
+elements, but this is not allowed by HTML5, and is flagged by
+the Nu checker. Because a <title> is required by HTML5, it
+would be even worse for HTML Tidy to remove this element, and
+so Tidy will now provide a warning if the title element is
+empty. It is assumed the HTML author will add a title as well
+as addressing other warnings.
+ -->
+<!DOCTYPE html><title></title>
diff --git a/regression_testing/cases/github-expects/case-839.html b/regression_testing/cases/github-expects/case-839.html
new file mode 100644
index 0000000..d32bc5c
--- /dev/null
+++ b/regression_testing/cases/github-expects/case-839.html
@@ -0,0 +1,19 @@
+<!--
+This test case represents HTML Tidy issue #839, which describes
+a descrepancy between tidy's behavior and the W3C Nu HTML
+checker behavior. Tidy has historically allowed empty <title>
+elements, but this is not allowed by HTML5, and is flagged by
+the Nu checker. Because a <title> is required by HTML5, it
+would be even worse for HTML Tidy to remove this element, and
+so Tidy will now provide a warning if the title element is
+empty. It is assumed the HTML author will add a title as well
+as addressing other warnings.
+ -->
+<!DOCTYPE html>
+<html>
+<head>
+  <title></title>
+</head>
+<body>
+</body>
+</html>
diff --git a/regression_testing/cases/github-expects/case-839.txt b/regression_testing/cases/github-expects/case-839.txt
new file mode 100644
index 0000000..7a8a19c
--- /dev/null
+++ b/regression_testing/cases/github-expects/case-839.txt
@@ -0,0 +1,14 @@
+line 12 column 16 - Warning: blank 'title' element
+Info: Document content looks like HTML5
+Tidy found 1 warning and 0 errors!
+
+About HTML Tidy: https://github.com/htacg/tidy-html5
+Bug reports and comments: https://github.com/htacg/tidy-html5/issues
+Official mailing list: https://lists.w3.org/Archives/Public/public-htacg/
+Latest HTML specification: http://dev.w3.org/html5/spec-author-view/
+Validate your HTML documents: http://validator.w3.org/nu/
+Lobby your company to join the W3C: http://www.w3.org/Consortium
+
+Do you speak a language other than English, or a different variant of 
+English? Consider helping us to localize HTML Tidy. For details please see 
+https://github.com/htacg/tidy-html5/blob/master/README/LOCALIZE.md
