From 48369a247abab60f100a84de8faef3cacf0b42c5 Mon Sep 17 00:00:00 2001
From: Anne van Kesteren <annevk@annevk.nl>
Date: Thu, 4 Jul 2024 14:35:10 +0200
Subject: [PATCH] MIME Sniffing: HTML no feed

For https://github.com/whatwg/mimesniff/pull/192.
---
 mimesniff/sniffing/html.window.js    | 12 ++++++++++++
 mimesniff/sniffing/support/atom.html |  3 +++
 mimesniff/sniffing/support/rss.html  |  3 +++
 3 files changed, 18 insertions(+)
 create mode 100644 mimesniff/sniffing/html.window.js
 create mode 100644 mimesniff/sniffing/support/atom.html
 create mode 100644 mimesniff/sniffing/support/rss.html

diff --git a/mimesniff/sniffing/html.window.js b/mimesniff/sniffing/html.window.js
new file mode 100644
index 00000000000000..3fef45bb477956
--- /dev/null
+++ b/mimesniff/sniffing/html.window.js
@@ -0,0 +1,12 @@
+["atom", "rss"].forEach(item => {
+  async_test(t => {
+    const popup = window.open(`support/${item}.html`);
+    t.add_cleanup(() => popup.close());
+    popup.onload = t.step_func_done(() => {
+      assert_equals(popup.document.contentType, "text/html");
+      assert_equals(popup.document.documentElement.localName, "html");
+      assert_equals(popup.document.documentElement.namespaceURI, "http://www.w3.org/1999/xhtml");
+      assert_equals(popup.document.querySelector("b").namespaceURI, "http://www.w3.org/1999/xhtml");
+    });
+  }, `HTML is not sniffed for a "feed": ${item}`);
+});
diff --git a/mimesniff/sniffing/support/atom.html b/mimesniff/sniffing/support/atom.html
new file mode 100644
index 00000000000000..b343d6d6154219
--- /dev/null
+++ b/mimesniff/sniffing/support/atom.html
@@ -0,0 +1,3 @@
+<atom>
+  <b>HELLO</b>
+</atom>
diff --git a/mimesniff/sniffing/support/rss.html b/mimesniff/sniffing/support/rss.html
new file mode 100644
index 00000000000000..d708b0d8ebdde7
--- /dev/null
+++ b/mimesniff/sniffing/support/rss.html
@@ -0,0 +1,3 @@
+<rss>
+  <b>HELLO</b>
+</rss>