diff --git a/accesskit/src/lib.rs b/accesskit/src/lib.rs
index 73dcf4d63..3112a3a40 100644
--- a/accesskit/src/lib.rs
+++ b/accesskit/src/lib.rs
@@ -918,6 +918,7 @@ enum PropertyId {
     AuthorId,
     ClassName,
     FontFamily,
+    HtmlId,
     HtmlTag,
     InnerHtml,
     KeyboardShortcut,
@@ -2082,6 +2083,12 @@ string_property_methods! {
     /// The font family used for this node's text. Only set this when it differs
     /// from the parent.
     (FontFamily, font_family, set_font_family, clear_font_family),
+    /// The ID of the HTML element represented by this node. On platforms
+    /// where both are mapped to the same platform property, this takes
+    /// precedence over [`author_id`].
+    ///
+    /// [`author_id`]: Node::author_id
+    (HtmlId, html_id, set_html_id, clear_html_id),
     /// The name of the HTML element represented by this node.
     (HtmlTag, html_tag, set_html_tag, clear_html_tag),
     /// Inner HTML of an element. Only used for a top-level math element,
@@ -2833,6 +2840,7 @@ impl<'de> Visitor<'de> for PropertiesVisitor {
                     AuthorId,
                     ClassName,
                     FontFamily,
+                    HtmlId,
                     HtmlTag,
                     InnerHtml,
                     KeyboardShortcut,
@@ -2985,6 +2993,7 @@ impl JsonSchema for Properties {
                 AuthorId,
                 ClassName,
                 FontFamily,
+                HtmlId,
                 HtmlTag,
                 InnerHtml,
                 KeyboardShortcut,
diff --git a/accesskit_consumer/src/node.rs b/accesskit_consumer/src/node.rs
index 87b748ccc..6e92d988c 100644
--- a/accesskit_consumer/src/node.rs
+++ b/accesskit_consumer/src/node.rs
@@ -982,6 +982,14 @@ impl<'a> NodeRef<'a> {
         self.data().author_id()
     }
 
+    pub fn html_id(&self) -> Option<&str> {
+        self.data().html_id()
+    }
+
+    pub fn has_html_id(&self) -> bool {
+        self.data().html_id().is_some()
+    }
+
     pub fn class_name(&self) -> Option<&str> {
         self.data().class_name()
     }
diff --git a/adapters/android/Cargo.toml b/adapters/android/Cargo.toml
index 60c4a06bc..102ab96a8 100644
--- a/adapters/android/Cargo.toml
+++ b/adapters/android/Cargo.toml
@@ -19,3 +19,4 @@ accesskit = { version = "0.24.1", path = "../../accesskit" }
 accesskit_consumer = { version = "0.38.0", path = "../../accesskit_consumer" }
 jni = "0.21.1"
 log = "0.4.17"
+
diff --git a/adapters/atspi-common/src/node.rs b/adapters/atspi-common/src/node.rs
index 4e7453dcc..c84677c68 100644
--- a/adapters/atspi-common/src/node.rs
+++ b/adapters/atspi-common/src/node.rs
@@ -397,6 +397,10 @@ impl NodeWrapper<'_> {
             .map(|s| s.to_string())
     }
 
+    fn html_id(&self) -> Option<&str> {
+        self.0.html_id()
+    }
+
     fn braille_label(&self) -> Option<&str> {
         self.0.braille_label()
     }
@@ -416,6 +420,9 @@ impl NodeWrapper<'_> {
         if let Some(size_of_set) = self.size_of_set() {
             attributes.insert("setsize", size_of_set);
         }
+        if let Some(html_id) = self.html_id() {
+            attributes.insert("id", html_id.to_string());
+        }
         if let Some(label) = self.braille_label() {
             attributes.insert("braillelabel", label.to_string());
         }
diff --git a/adapters/ios/src/node.rs b/adapters/ios/src/node.rs
index c7109e1c5..902f39079 100644
--- a/adapters/ios/src/node.rs
+++ b/adapters/ios/src/node.rs
@@ -179,6 +179,10 @@ impl NodeWrapper<'_> {
             _ => UIAccessibilityContainerType::None,
         }
     }
+
+    fn identifier(&self) -> Option<&str> {
+        self.0.html_id().or_else(|| self.0.author_id())
+    }
 }
 
 pub(crate) struct PlatformNodeIvars {
@@ -425,7 +429,8 @@ declare_class!(
         #[method_id(accessibilityIdentifier)]
         fn identifier(&self) -> Option<Retained<NSString>> {
             self.resolve(|node| {
-                node.author_id().map(NSString::from_str)
+                let wrapper = NodeWrapper(node);
+                wrapper.identifier().map(NSString::from_str)
             })
             .flatten()
         }
@@ -556,6 +561,10 @@ mod tests {
         NodeWrapper(&node).can_be_focused()
     }
 
+    fn wrapper_identifier(node: &Node) -> Option<String> {
+        with_single(node, |n| NodeWrapper(n).identifier().map(String::from))
+    }
+
     // ---- label ----
 
     #[test]
@@ -1012,4 +1021,34 @@ mod tests {
             FrameSource::Rect(_),
         ));
     }
+
+    // ---- identifier ----
+
+    #[test]
+    fn identifier_from_html_id() {
+        let mut node = Node::new(Role::Button);
+        node.set_html_id("html-btn1");
+        assert_eq!(wrapper_identifier(&node), Some("html-btn1".into()));
+    }
+
+    #[test]
+    fn identifier_from_author_id() {
+        let mut node = Node::new(Role::Button);
+        node.set_author_id("native-btn1");
+        assert_eq!(wrapper_identifier(&node), Some("native-btn1".into()));
+    }
+
+    #[test]
+    fn html_id_takes_precedence_over_author_id_for_identifier() {
+        let mut node = Node::new(Role::Button);
+        node.set_author_id("native-btn1");
+        node.set_html_id("html-btn1");
+        assert_eq!(wrapper_identifier(&node), Some("html-btn1".into()));
+    }
+
+    #[test]
+    fn identifier_absent() {
+        let node = Node::new(Role::Button);
+        assert!(wrapper_identifier(&node).is_none());
+    }
 }
diff --git a/adapters/macos/src/node.rs b/adapters/macos/src/node.rs
index 00a07c0da..bedcedbe1 100644
--- a/adapters/macos/src/node.rs
+++ b/adapters/macos/src/node.rs
@@ -1086,6 +1086,8 @@ declare_class!(
                     return Some(NSString::from_str(node.braille_label().unwrap()))
                 } else if attr == ns_string!("AXBrailleRoleDescription") && node.has_braille_role_description() {
                     return Some(NSString::from_str(node.braille_role_description().unwrap()))
+                } else if attr == ns_string!("AXDOMIdentifier") && node.has_html_id() {
+                    return Some(NSString::from_str(node.html_id().unwrap()))
                 }
 
                 None
@@ -1280,7 +1282,9 @@ declare_class!(
                     return node.is_dialog();
                 }
                 if selector == sel!(accessibilityAttributeValue:) {
-                    return node.has_braille_label() || node.has_braille_role_description()
+                    return node.has_braille_label()
+                        || node.has_braille_role_description()
+                        || node.has_html_id()
                 }
                 if selector == sel!(accessibilityURL) {
                     return node.supports_url();
diff --git a/adapters/unix/Cargo.toml b/adapters/unix/Cargo.toml
index de3d137af..ae94e6185 100644
--- a/adapters/unix/Cargo.toml
+++ b/adapters/unix/Cargo.toml
@@ -36,3 +36,4 @@ tokio-stream = { version = "0.1.14", optional = true }
 version = "1.32.0"
 optional = true
 features = ["macros", "net", "rt", "sync", "time"]
+
diff --git a/adapters/windows/src/node.rs b/adapters/windows/src/node.rs
index 7cf2b594b..f414f770f 100644
--- a/adapters/windows/src/node.rs
+++ b/adapters/windows/src/node.rs
@@ -554,7 +554,8 @@ impl NodeWrapper<'_> {
 
     fn automation_id(&mut self) -> Option<StrWrapper<'_>> {
         self.node
-            .author_id()
+            .html_id()
+            .or_else(|| self.node.author_id())
             .map(|s| StrWrapper::new(s, self.string_buffer))
     }
 
diff --git a/adapters/winit/Cargo.toml b/adapters/winit/Cargo.toml
index 558b43a30..1f024fc10 100644
--- a/adapters/winit/Cargo.toml
+++ b/adapters/winit/Cargo.toml
@@ -57,3 +57,4 @@ features = [
 [target.'cfg(target_os = "ios")'.dev-dependencies.softbuffer]
 version = "0.4.8"
 default-features = false
+