Implement tag name selector for FindElementsFromElement WebDriver command

components/script/script_thread.rs

@@ -2070,6 +2070,15 @@ impl ScriptThread {
                     reply,
                 )
             },
+            WebDriverScriptCommand::FindElementElementsTagName(selector, element_id, reply) => {
+                webdriver_handlers::handle_find_element_elements_tag_name(
+                    &*documents,
+                    pipeline_id,
+                    element_id,
+                    selector,
+                    reply,
+                )
+            },
             WebDriverScriptCommand::FocusElement(element_id, reply) => {
                 webdriver_handlers::handle_focus_element(
                     &*documents,

components/script/webdriver_handlers.rs

@@ -284,7 +284,7 @@ pub fn handle_find_element_elements_css(
     pipeline: PipelineId,
     element_id: String,
     selector: String,
-    reply: IpcSender<Result<Option<String>, ()>>,
+    reply: IpcSender<Result<Vec<String>, ()>>,
 ) {
     let node_ids = find_node_by_unique_id(documents, pipeline, element_id)
         .ok_or(())
@@ -295,12 +295,34 @@ pub fn handle_find_element_elements_css(
         .map(|nodes| {
             nodes
                 .iter()
-                .map(|x| Some(x.upcast::<Node>().unique_id()))
+                .map(|x| x.upcast::<Node>().unique_id())
                 .collect()
         });
     reply.send(node_ids).unwrap();
 }
 
+pub fn handle_find_element_elements_tag_name(
+    documents: &Documents,
+    pipeline: PipelineId,
+    element_id: String,
+    selector: String,
+    reply: IpcSender<Result<Vec<String>, ()>>,
+) {
+    let node_ids = find_node_by_unique_id(documents, pipeline, element_id)
+        .ok_or(())
+        .and_then(|node| match node.downcast::<Element>() {
+            Some(elem) => Ok(elem.GetElementsByTagName(DOMString::from(selector))),
+            None => Err(()),
+        })
+        .map(|nodes| {
+            nodes
+                .elements_iter()
+                .map(|x| x.upcast::<Node>().unique_id())
+                .collect::<Vec<String>>()
+        });
+    reply.send(node_ids).unwrap();
+}
+
 pub fn handle_focus_element(
     documents: &Documents,
     pipeline: PipelineId,

components/script_traits/webdriver_msg.rs

@@ -30,7 +30,8 @@ pub enum WebDriverScriptCommand {
     FindElementsTagName(String, IpcSender<Result<Vec<String>, ()>>),
     FindElementElementCSS(String, String, IpcSender<Result<Option<String>, ()>>),
     FindElementElementTagName(String, String, IpcSender<Result<Option<String>, ()>>),
-    FindElementElementsCSS(String, String, IpcSender<Result<Option<String>, ()>>),
+    FindElementElementsCSS(String, String, IpcSender<Result<Vec<String>, ()>>),
+    FindElementElementsTagName(String, String, IpcSender<Result<Vec<String>, ()>>),
     FocusElement(String, IpcSender<Result<(), ()>>),
     GetActiveElement(IpcSender<Option<String>>),
     GetCookie(String, IpcSender<Vec<Serde<Cookie<'static>>>>),

components/webdriver_server/lib.rs

@@ -997,34 +997,46 @@ impl Handler {
         element: &WebElement,
         parameters: &LocatorParameters,
     ) -> WebDriverResult<WebDriverResponse> {
-        if parameters.using != LocatorStrategy::CSSSelector {
-            return Err(WebDriverError::new(
-                ErrorStatus::UnsupportedOperation,
-                "Unsupported locator strategy",
-            ));
-        }
-
         let (sender, receiver) = ipc::channel().unwrap();
+
+        match parameters.using {
+            LocatorStrategy::CSSSelector => {
                 let cmd = WebDriverScriptCommand::FindElementElementsCSS(
                     parameters.value.clone(),
                     element.id.clone(),
                     sender,
                 );
-
                 self.browsing_context_script_command(cmd)?;
+            },
+            LocatorStrategy::TagName => {
+                let cmd = WebDriverScriptCommand::FindElementElementsTagName(
+                    parameters.value.clone(),
+                    element.id.clone(),
+                    sender,
+                );
+                self.browsing_context_script_command(cmd)?;
+            },
+            _ => {
+                return Err(WebDriverError::new(
+                    ErrorStatus::UnsupportedOperation,
+                    "Unsupported locator strategy",
+                ));
+            },
+        }
 
         match receiver.recv().unwrap() {
             Ok(value) => {
-                let value_resp = value
+                let resp_value: Vec<Value> = value
                     .into_iter()
                     .map(|x| serde_json::to_value(WebElement::new(x)).unwrap())
-                    .collect::<Vec<Value>>();
+                    .collect();
-                let value_resp = serde_json::Value::Array(value_resp);
+                Ok(WebDriverResponse::Generic(ValueResponse(
-                Ok(WebDriverResponse::Generic(ValueResponse(value_resp)))
+                    serde_json::to_value(resp_value)?,
+                )))
             },
             Err(_) => Err(WebDriverError::new(
                 ErrorStatus::InvalidSelector,
-                "Invalid Selector",
+                "Invalid selector",
             )),
         }
     }

tests/wpt/metadata/webdriver/tests/find_elements_from_element/find.py.ini

@@ -44,18 +44,12 @@
   [test_parent_of_document_node_errors]
     expected: FAIL
 
-  [test_no_element[css selector-#wontExist\]]
-    expected: FAIL
-
   [test_find_elements_partial_link_text[<a href=#>partial link&amp;text</a>-k&t\]]
     expected: FAIL
 
   [test_find_elements[xpath-//a\]]
     expected: FAIL
 
-  [test_find_elements[tag name-a\]]
-    expected: FAIL
-
   [test_find_elements_partial_link_text[<a href=# style='text-transform: uppercase'>partial link text</a>-LINK\]]
     expected: FAIL