diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 2c3048f80422..dd1d1b85d00c 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -306307,6 +306307,12 @@
      {}
     ]
    ],
+   "apng/supported-in-source-type.html": [
+    [
+     "/apng/supported-in-source-type.html",
+     {}
+    ]
+   ],
    "audio-output/HTMLMediaElement-sinkId-idl.html": [
     [
      "/audio-output/HTMLMediaElement-sinkId-idl.html",
@@ -400104,6 +400110,10 @@
    "b9ba0287c92e5dbda1dc207ab45e9c90e8618878",
    "reftest"
   ],
+  "apng/supported-in-source-type.html": [
+   "32cf112fb1dcb4e7ec3c91bdf5bd6b976a1e4eac",
+   "testharness"
+  ],
   "audio-output/HTMLMediaElement-sinkId-idl.html": [
    "8f37d8d2fc1cb9b5ad0d85234f733f534f4f0db8",
    "testharness"
diff --git a/testing/web-platform/tests/apng/supported-in-source-type.html b/testing/web-platform/tests/apng/supported-in-source-type.html
new file mode 100644
index 000000000000..0a4d232dcb1c
--- /dev/null
+++ b/testing/web-platform/tests/apng/supported-in-source-type.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>Animated PNG MIME type (image/apng) is recognized by &lt;source type></title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+function resolveUrl(relativeUrl) {
+  var a = document.createElement('a');
+  a.href = relativeUrl;
+  return a.href;
+}
+
+async_test(t => {
+  window.onload = t.step_func_done(() => {
+    let image = document.querySelector('img');
+    let apngSrc = document.querySelector('source');
+    assert_equals(image.currentSrc, resolveUrl(apngSrc.srcset));
+  });
+});
+</script>
+<picture>
+  <source srcset="/images/anim-gr.png" type="image/apng">
+  <img src="/images/anim-gr.gif" style="visibility: hidden">
+</picture>
