1 files changed, 28 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/textfieldselection/defaultSelection.html b/testing/web-platform/tests/html/semantics/forms/textfieldselection/defaultSelection.html
new file mode 100644
index 0000000000..be965bf5cf
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/textfieldselection/defaultSelection.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<meta charset="utf-8">
+<title></title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<textarea>foo</textarea>
+<input type="text" value="foo"></input>
+<script>
+
+for (let el of [document.querySelector("textarea"), document.querySelector("input")]) {
+    test(function() {
+        assert_equals(el.selectionStart, 0);
+        assert_equals(el.selectionEnd, 0);
+    }, `Default selectionStart and selectionEnd for ${el}`);
+
+    test(function() {
+        el.value="foo";
+        assert_equals(el.selectionStart, 0);
+        assert_equals(el.selectionEnd, 0);
+    }, `selectionStart and selectionEnd do not change when same value set again for ${el}`);
+
+    test(function() {
+        el.value="Foo";
+        assert_equals(el.selectionStart, 3);
+        assert_equals(el.selectionEnd, 3);
+    }, `selectionStart and selectionEnd change when value changed to upper case for ${el}`);
+  }
+</script>