1 files changed, 58 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/the-textarea-element/wrapping-transformation.window.js b/testing/web-platform/tests/html/semantics/forms/the-textarea-element/wrapping-transformation.window.js
new file mode 100644
index 0000000000..c5c28a4854
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-textarea-element/wrapping-transformation.window.js
@@ -0,0 +1,58 @@
+test((t) => {
+  const form = document.createElement("form");
+  const textarea = document.createElement("textarea");
+  textarea.name = "linebreakTest";
+  textarea.textContent = "a\nb\rc\r\nd\n\re";
+  form.appendChild(textarea);
+  document.body.appendChild(form);
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+  });
+
+  assert_equals(textarea.textContent, "a\nb\rc\r\nd\n\re");
+  assert_equals(textarea.value, "a\nb\nc\nd\n\ne");
+
+  const formData = new FormData(form);
+  assert_equals(
+    formData.get("linebreakTest"),
+    "a\nb\nc\nd\n\ne",
+  );
+}, "Textarea wrapping transformation: Newlines should be normalized to LF.");
+
+test((t) => {
+  const form = document.createElement("form");
+  const textarea = document.createElement("textarea");
+  textarea.name = "wrapTest";
+  textarea.cols = 10;
+  textarea.wrap = "hard";
+  textarea.textContent =
+    "Some text that is too long for the specified character width.";
+  form.appendChild(textarea);
+  document.body.appendChild(form);
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+  });
+
+  assert_true(
+    !textarea.textContent.includes("\n") &&
+      !textarea.textContent.includes("\r"),
+    "textContent shouldn't contain any newlines",
+  );
+  assert_true(
+    !textarea.textContent.includes("\n") &&
+      !textarea.textContent.includes("\r"),
+    "The API value shouldn't be line wrapped.",
+  );
+
+  const formData = new FormData(form);
+  const formDataValue = formData.get("wrapTest");
+
+  assert_true(
+    !formDataValue.includes("\r"),
+    "The wrapping done on the value must be LF, not CRLF.",
+  );
+  assert_true(
+    formDataValue.includes("\n"),
+    "The value must be wrapped.",
+  );
+}, "Textarea wrapping transformation: Wrapping happens with LF newlines.");