Bug 1906289 [wpt PR 47002] - MIME Sniffing: HTML no feed, a=testonly

Automatic update from web-platform-tests
MIME Sniffing: HTML no feed

For whatwg/mimesniff#192.

--

wpt-commits: 48369a247abab60f100a84de8faef3cacf0b42c5
wpt-pr: 47002

testing/web-platform/tests/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}`);
+});

testing/web-platform/tests/mimesniff/sniffing/support/atom.html

@@ -0,0 +1,3 @@
+<atom>
+  <b>HELLO</b>
+</atom>

testing/web-platform/tests/mimesniff/sniffing/support/rss.html

@@ -0,0 +1,3 @@
+<rss>
+  <b>HELLO</b>
+</rss>