1 files changed, 83 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/the-input-element/files.html b/testing/web-platform/tests/html/semantics/forms/the-input-element/files.html
new file mode 100644
index 0000000000..43ebd71906
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-input-element/files.html
@@ -0,0 +1,83 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>HTMLInputElement#files</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+var types = [
+  "hidden",
+  "text",
+  "search",
+  "tel",
+  "url",
+  "email",
+  "password",
+  "date",
+  "month",
+  "week",
+  "time",
+  "datetime-local",
+  "number",
+  "range",
+  "color",
+  "checkbox",
+  "radio",
+  "submit",
+  "image",
+  "reset",
+  "button",
+];
+
+types.forEach(function(type) {
+  test(function() {
+    const input = document.createElement("input"),
+          input2 = document.createElement("input");
+    input.type = type;
+    input2.type = "file";
+    assert_equals(input.files, null, "files should be null");
+
+    input.files = input2.files;
+    assert_equals(input.files, null, "files should remain null as it cannot be set when it does not apply");
+  }, "files for input type=" + type);
+});
+
+test(function() {
+  var input = document.createElement("input");
+  input.type = "file";
+  assert_not_equals(input.files, null);
+  assert_true(input.files instanceof FileList, "files should be a FileList");
+  var files = input.files;
+  assert_equals(input.files, files, "files should return the same object");
+}, "files for input type=file");
+
+test(() => {
+  const i1 = document.createElement("input"),
+        i2 = document.createElement("input");
+  i1.type = "file";
+  i2.type = "file";
+
+  const files = i2.files;
+  i1.files = i2.files;
+  assert_equals(i1.files, files, "FileList should not be copied");
+  assert_equals(i2.files, files, "FileList can be shared across input elements");
+
+  i1.files = null;
+  assert_equals(i1.files, files, "files cannot be set to null");
+
+  assert_throws_js(TypeError, () => i1.files = [], "files cannot be set to an array");
+  assert_throws_js(TypeError, () => i1.files = [new File([], "x")], "files cannot be set to an array (even when it contains File objects)");
+}, "setting <input type=file>.files");
+
+test(() => {
+  const i = document.createElement("input");
+  i.type = "file";
+
+  let dt = new DataTransfer();
+
+  const files = dt.files;
+  i.files = files;
+  assert_equals(i.files, files, "FileList should not be copied");
+  assert_equals(dt.files, files, "FileList can be shared across input / DataTransfer");
+}, "setting <input type=file>.files from DataTransfer");
+</script>