1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-values/container-progress-serialize.tentative.html b/testing/web-platform/tests/css/css-values/container-progress-serialize.tentative.html
new file mode 100644
index 0000000000..181054c653
--- /dev/null
+++ b/testing/web-platform/tests/css/css-values/container-progress-serialize.tentative.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-values-5/#container-progress-func">
+<link rel="author" title="sakhapov@chromuim.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/serialize-testcommon.js"></script>
+<div id="outer-container">
+  <div id="inner-container">
+    <div id=target></div>
+  </div>
+</div>
+<style>
+:root {
+  font-size: 10px;
+}
+#outer-container {
+  container: my-container / size;
+  width: 322px;
+  height: 228px;
+}
+#inner-container {
+  container-type: size;
+  width: 228px;
+  height: 322px;
+}
+#target {
+  font-size: 10px;
+}
+</style>
+<script>
+function test_serialization(t,s,c) {
+    test_specified_serialization('opacity', t, s);
+    test_specified_serialization('transform', `scale(${t})`, `scale(${s})`);
+    test_computed_serialization('opacity', t, c);
+    test_computed_serialization('transform', `scale(${t})`, `matrix(${c}, 0, 0, ${c}, 0, 0)`);
+}
+
+test_serialization(
+    'calc(container-progress(width from 0px to 1px) / 1000)',
+    'calc(container-progress(width from 0px to 1px) / 1000)',
+    '0.228',
+);
+test_serialization(
+    'calc(0.1 * container-progress(height of my-container from 0px to 10em))',
+    'calc(0.1 * container-progress(height of my-container from 0px to 10em))',
+    '0.228',
+);
+</script>