1 files changed, 39 insertions, 0 deletions
diff --git a/dom/media/test/can_play_type_webm.js b/dom/media/test/can_play_type_webm.js
new file mode 100644
index 0000000000..315a8ef3d9
--- /dev/null
+++ b/dom/media/test/can_play_type_webm.js
@@ -0,0 +1,39 @@
+async function check_webm(v, enabled) {
+  function check(type, expected) {
+    is(
+      v.canPlayType(type),
+      enabled ? expected : "",
+      type + "='" + expected + "'"
+    );
+  }
+
+  // WebM types
+  check("video/webm", "maybe");
+  check("audio/webm", "maybe");
+
+  var video = ["vp8", "vp8.0", "vp9", "vp9.0"];
+  var audio = ["vorbis", "opus"];
+
+  audio.forEach(function (acodec) {
+    check("audio/webm; codecs=" + acodec, "probably");
+    check("video/webm; codecs=" + acodec, "probably");
+  });
+  video.forEach(function (vcodec) {
+    check("video/webm; codecs=" + vcodec, "probably");
+    audio.forEach(function (acodec) {
+      check('video/webm; codecs="' + vcodec + ", " + acodec + '"', "probably");
+      check('video/webm; codecs="' + acodec + ", " + vcodec + '"', "probably");
+    });
+  });
+
+  // Unsupported WebM codecs
+  check("video/webm; codecs=xyz", "");
+  check("video/webm; codecs=xyz,vorbis", "");
+  check("video/webm; codecs=vorbis,xyz", "");
+
+  await SpecialPowers.pushPrefEnv({ set: [["media.av1.enabled", true]] });
+  check('video/webm; codecs="av1"', "probably");
+
+  await SpecialPowers.pushPrefEnv({ set: [["media.av1.enabled", false]] });
+  check('video/webm; codecs="av1"', "");
+}