Implement Element Send Keys according to spec

README.md

@@ -243,6 +243,14 @@ There is an interpretation to use the WebDriver specification to drive native au
 | tag name                           | Control type in Windows                                                                                                                |
 | attribute                          | [UI automation element property](https://learn.microsoft.com/en-us/windows/win32/winauto/uiauto-automation-element-propids) in Windows |
 
+### Deviations from W3C WebDriver Spec
+
+https://www.w3.org/TR/webdriver2/#element-send-keys says:
+
+> Set the text insertion caret using set selection range using current text length for both the start and end parameters.
+
+This is impossible using UIA, as there is no API to set the caret position: text instead gets inserted at the beginning of a text box. This is also WinAppDriver's behavior.
+
 ### Element Attributes
 
 Attributes are mapped to UI automation element properties. Attributes without a period (`.`) are mapped to [Automation Element Properties](https://learn.microsoft.com/en-us/windows/win32/winauto/uiauto-automation-element-propids). For example to read the `UIA_ClassNamePropertyId` using Selenium WebDriver:

src/FlaUI.WebDriver.UITests/ElementTests.cs

@@ -1,9 +1,9 @@
-using FlaUI.WebDriver.UITests.TestUtil;
+using System.Threading;
+using FlaUI.WebDriver.UITests.TestUtil;
 using NUnit.Framework;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Interactions;
 using OpenQA.Selenium.Remote;
-using System;
 
 namespace FlaUI.WebDriver.UITests
 {
@@ -134,7 +134,51 @@ public void SendKeys_Default_IsSupported()
 
             element.SendKeys("Hello World!");
 
-            Assert.That(element.Text, Is.EqualTo("Hello World!"));
+            Assert.That(element.Text, Is.EqualTo("Hello World!Test TextBox"));
+        }
+
+        [Test]
+        public void SendKeys_ShiftedCharacter_ShiftIsReleased()
+        {
+            var driverOptions = FlaUIDriverOptions.TestApp();
+            using var driver = new RemoteWebDriver(WebDriverFixture.WebDriverUrl, driverOptions);
+            var element = driver.FindElement(ExtendedBy.AccessibilityId("TextBox"));
+
+            element.SendKeys("!");
+            element.SendKeys("1");
+
+            Assert.That(element.Text, Is.EqualTo("!1Test TextBox"));
+        }
+
+        [Test]
+        public void SendKeys_DownArrow_IsSupported()
+        {
+            var driverOptions = FlaUIDriverOptions.TestApp();
+            using var driver = new RemoteWebDriver(WebDriverFixture.WebDriverUrl, driverOptions);
+            var element = driver.FindElement(ExtendedBy.AccessibilityId("NonEditableCombo"));
+
+            element.SendKeys(Keys.Down);
+
+            Assert.That(element.Text, Is.EqualTo("Item 2"));
+        }
+
+        [Test, Ignore("Alt key combinations currently fail due to https://github.com/FlaUI/FlaUI/issues/320")]
+        public void SendKeys_AltDownArrowEscape_IsSupported()
+        {
+            var driverOptions = FlaUIDriverOptions.TestApp();
+            using var driver = new RemoteWebDriver(WebDriverFixture.WebDriverUrl, driverOptions);
+            var element = driver.FindElement(ExtendedBy.AccessibilityId("NonEditableCombo"));
+            var expandCollapseState = element.GetDomAttribute("ExpandCollapse.ExpandCollapseState");
+
+            Assert.That(expandCollapseState, Is.EqualTo("Collapsed"));
+
+            element.SendKeys(Keys.Alt + Keys.Down);
+
+            Assert.That(expandCollapseState, Is.EqualTo("Expanded"));
+
+            element.SendKeys(Keys.Escape);
+
+            Assert.That(expandCollapseState, Is.EqualTo("Collapsed"));
         }
 
         [Test]

src/FlaUI.WebDriver/Action.cs

@@ -6,6 +6,7 @@ public class Action
     {
         public Action(ActionSequence actionSequence, ActionItem actionItem)
         {
+            Id = actionSequence.Id;
             Type = actionSequence.Type;
             SubType = actionItem.Type;
             Button = actionItem.Button;
@@ -29,6 +30,7 @@ public Action(ActionSequence actionSequence, ActionItem actionItem)
 
         public Action(Action action)
         {
+            Id = action.Id;
             Type = action.Type;
             SubType = action.SubType;
             Button = action.Button;
@@ -50,6 +52,7 @@ public Action(Action action)
             Value = action.Value;
         }
 
+        public string Id { get; set; }
         public string Type { get; set; }
         public string SubType { get; set; }
         public int? Button { get; set; }