1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/the-input-element/input-type-change-value.html b/testing/web-platform/tests/html/semantics/forms/the-input-element/input-type-change-value.html
new file mode 100644
index 0000000000..74aeef7cd5
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-input-element/input-type-change-value.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Input type switch from / to color</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://html.spec.whatwg.org/#input-type-change">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1833477">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+function runTest(focus) {
+  let input = document.createElement("input");
+  input.type = "color";
+  document.body.appendChild(input);
+  if (focus) {
+    input.focus();
+  }
+  assert_equals(input.value, "#000000", "Invalid color should return a non-empty sanitized value");
+  input.type = "text";
+  assert_equals(input.value, "", "Value dirty flag should remain false");
+  input.type = "color";
+  input.value = "#ffffff";
+  assert_equals(input.value, "#ffffff", "Valid color is returned");
+  input.type = "text";
+  assert_equals(input.value, "#ffffff", "Value dirty flag should remain true");
+  if (focus) {
+    assert_equals(document.activeElement, input, "Focus is preserved");
+  }
+}
+test(() => runTest(false), "Without focus");
+test(() => runTest(true), "With focus");
+</script>