Implement tag name selector for FindElement WebDriver command

components/script/script_thread.rs

@@ -2019,6 +2019,14 @@ impl ScriptThread {
                     reply,
                 )
             },
+            WebDriverScriptCommand::FindElementTagName(selector, reply) => {
+                webdriver_handlers::handle_find_element_tag_name(
+                    &*documents,
+                    pipeline_id,
+                    selector,
+                    reply,
+                )
+            },
             WebDriverScriptCommand::FindElementsCSS(selector, reply) => {
                 webdriver_handlers::handle_find_elements_css(
                     &*documents,

components/script/webdriver_handlers.rs

@@ -182,6 +182,25 @@ pub fn handle_find_element_css(
     reply.send(node_id).unwrap();
 }
 
+pub fn handle_find_element_tag_name(
+    documents: &Documents,
+    pipeline: PipelineId,
+    selector: String,
+    reply: IpcSender<Result<Option<String>, ()>>,
+) {
+    let node_id = documents
+        .find_document(pipeline)
+        .ok_or(())
+        .and_then(|doc| {
+            Ok(doc
+                .GetElementsByTagName(DOMString::from(selector))
+                .elements_iter()
+                .next())
+        })
+        .map(|node| node.map(|x| x.upcast::<Node>().unique_id()));
+    reply.send(node_id).unwrap();
+}
+
 pub fn handle_find_elements_css(
     documents: &Documents,
     pipeline: PipelineId,

components/script_traits/webdriver_msg.rs

@@ -25,6 +25,7 @@ pub enum WebDriverScriptCommand {
     ExecuteScript(String, IpcSender<WebDriverJSResult>),
     ExecuteAsyncScript(String, IpcSender<WebDriverJSResult>),
     FindElementCSS(String, IpcSender<Result<Option<String>, ()>>),
+    FindElementTagName(String, IpcSender<Result<Option<String>, ()>>),
     FindElementsCSS(String, IpcSender<Result<Vec<String>, ()>>),
     FindElementElementCSS(String, String, IpcSender<Result<Option<String>, ()>>),
     FindElementElementsCSS(String, String, IpcSender<Result<Option<String>, ()>>),

components/webdriver_server/lib.rs

@@ -804,17 +804,25 @@ impl Handler {
         &self,
         parameters: &LocatorParameters,
     ) -> WebDriverResult<WebDriverResponse> {
-        if parameters.using != LocatorStrategy::CSSSelector {
-            return Err(WebDriverError::new(
-                ErrorStatus::UnsupportedOperation,
-                "Unsupported locator strategy",
-            ));
-        }
-
         let (sender, receiver) = ipc::channel().unwrap();
 
-        let cmd = WebDriverScriptCommand::FindElementCSS(parameters.value.clone(), sender);
+        match parameters.using {
-        self.browsing_context_script_command(cmd)?;
+            LocatorStrategy::CSSSelector => {
+                let cmd = WebDriverScriptCommand::FindElementCSS(parameters.value.clone(), sender);
+                self.browsing_context_script_command(cmd)?;
+            },
+            LocatorStrategy::TagName => {
+                let cmd =
+                    WebDriverScriptCommand::FindElementTagName(parameters.value.clone(), sender);
+                self.browsing_context_script_command(cmd)?;
+            },
+            _ => {
+                return Err(WebDriverError::new(
+                    ErrorStatus::UnsupportedOperation,
+                    "Unsupported locator strategy",
+                ));
+            },
+        }
 
         match receiver.recv().unwrap() {
             Ok(value) => {

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

@@ -11,9 +11,6 @@
   [test_find_element_partial_link_text[<a href=#>&nbsp;partial link text&nbsp;</a>-link\]]
     expected: FAIL
 
-  [test_htmldocument[tag name-html\]]
-    expected: FAIL
-
   [test_find_element_link_text[<a href=#>link<br>text</a>-link\ntext\]]
     expected: FAIL
 
@@ -62,9 +59,6 @@
   [test_find_element_partial_link_text[<a href=#>partial link text</a>-k t\]]
     expected: FAIL
 
-  [test_find_element[tag name-a\]]
-    expected: FAIL
-
   [test_xhtml_namespace[partial link text-link text\]]
     expected: FAIL