2 files changed, 65 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/dom/elements/images/bypass-cache-revalidation.html b/testing/web-platform/tests/html/dom/elements/images/bypass-cache-revalidation.html
new file mode 100644
index 0000000000..38cdd876da
--- /dev/null
+++ b/testing/web-platform/tests/html/dom/elements/images/bypass-cache-revalidation.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<title>Cached images can bypass revalidation</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<div id="imageDiv1"></div>
+<div id="imageDiv2"></div>
+<canvas id="canvas"></canvas>
+<script>
+
+function getImagePixel(image)
+{
+    canvas.getContext("2d").drawImage(image, 0, 0, 10, 10);
+    return canvas.getContext("2d").getImageData(0, 0, 1, 1).data;
+}
+
+let resolve;
+promise_test(async (t) => {
+   const url = "image.py?id=" + token();
+
+   let promise = new Promise(r => resolve = r);
+   imageDiv1.innerHTML = `<img src="${url}" onload="resolve()"></img>`;
+   await promise;
+
+   const url2 = "image.py?id=" + token();
+   promise = new Promise(r => resolve = r);
+   imageDiv1.innerHTML = `<img src="${url2}" onload="resolve()"></img>`;
+   await promise;
+
+   promise = new Promise(r => resolve = r);
+   imageDiv2.innerHTML = `<img id="image2" src="${url}" onload="resolve()"></img>`;
+   await promise;
+
+   assert_array_equals(getImagePixel(image2), [0, 255, 0, 255]);
+}, "Images can bypass no-cache");
+</script>
+
diff --git a/testing/web-platform/tests/html/dom/elements/images/image.py b/testing/web-platform/tests/html/dom/elements/images/image.py
new file mode 100644
index 0000000000..b8bb34e618
--- /dev/null
+++ b/testing/web-platform/tests/html/dom/elements/images/image.py
@@ -0,0 +1,28 @@
+import os.path
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+
+    key = request.GET[b'id']
+    alreadyServedRequest = False
+    try:
+      alreadyServedRequest = request.server.stash.take(key)
+    except (KeyError, ValueError) as e:
+      pass
+
+    if alreadyServedRequest:
+      body = open(os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"../../../../images/red.png"), u"rb").read()
+    else:
+      request.server.stash.put(key, True);
+      body = open(os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"../../../../images/green.png"), u"rb").read()
+      pass
+
+    response.writer.write_status(200)
+    response.writer.write_header(b"etag", b"abcdef")
+    response.writer.write_header(b"content-length", len(body))
+    response.writer.write_header(b"content-type", b"image/png")
+    response.writer.write_header(b"cache-control", b"public, max-age=31536000, no-cache")
+    response.writer.end_headers()
+
+    response.writer.write(body)