diff --git a/Cargo.lock b/Cargo.lock
index 31d9749..58c87ba 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -35,7 +35,7 @@ checksum = "6c20b6793b5c2fa6553b250154b78d6d0db37e72700ae35fad9387a46f487c97"
 
 [[package]]
 name = "simplecss"
-version = "0.2.2"
+version = "0.2.3"
 dependencies = [
  "env_logger",
  "log",
diff --git a/Cargo.toml b/Cargo.toml
index 275d0a7..dcb474f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "simplecss"
-version = "0.2.2"
+version = "0.2.3"
 license = "Apache-2.0 OR MIT"
 edition = "2021"
 description = "A simple CSS 2 parser and selector."
diff --git a/examples/parse.rs b/examples/parse.rs
index c355d17..464c30c 100644
--- a/examples/parse.rs
+++ b/examples/parse.rs
@@ -3,11 +3,11 @@
 
 //! Parse
 
-use std::io::{Read, Write};
+use std::io::Write;
 
 fn main() {
     let args: Vec<_> = std::env::args().collect();
-    if args.len() != 2 {
+    if args.len() < 2 || 3 < args.len() {
         println!("Usage:\n\tparse style.css\n\tparse - 'p {{ color:red }}'");
         std::process::exit(1);
     }
@@ -17,12 +17,8 @@ fn main() {
         .format(|buf, record| writeln!(buf, "{}: {}", record.level(), record.args()))
         .init();
 
-    let text = if args[1] == "-" {
-        let mut buffer = String::new();
-        let stdin = std::io::stdin();
-        let mut handle = stdin.lock();
-        handle.read_to_string(&mut buffer).unwrap();
-        buffer
+    let text = if args[1] == "-" && args.len() == 3 {
+        args[2].clone()
     } else {
         std::fs::read_to_string(&args[1]).unwrap()
     };
diff --git a/src/selector.rs b/src/selector.rs
index e902933..d7e9e77 100644
--- a/src/selector.rs
+++ b/src/selector.rs
@@ -54,6 +54,7 @@ pub enum PseudoClass<'a> {
     Active,
     Focus,
     Lang(&'a str),
+    Root,
 }
 
 impl fmt::Display for PseudoClass<'_> {
@@ -66,6 +67,7 @@ impl fmt::Display for PseudoClass<'_> {
             PseudoClass::Active => write!(f, "active"),
             PseudoClass::Focus => write!(f, "focus"),
             PseudoClass::Lang(lang) => write!(f, "lang({lang})"),
+            PseudoClass::Root => write!(f, "root"),
         }
     }
 }
@@ -314,6 +316,7 @@ pub(crate) fn parse(text: &str) -> (Option<Selector<'_>>, usize) {
                     "hover" => PseudoClass::Hover,
                     "active" => PseudoClass::Active,
                     "focus" => PseudoClass::Focus,
+                    "root" => PseudoClass::Root,
                     _ => {
                         warn!("':{}' is not supported. Selector skipped.", ident);
                         return (None, tokenizer.stream.pos());
diff --git a/src/stream.rs b/src/stream.rs
index ce49901..d918dd1 100644
--- a/src/stream.rs
+++ b/src/stream.rs
@@ -16,7 +16,7 @@ impl CssCharExt for char {
     #[inline]
     fn is_name_start(&self) -> bool {
         match *self {
-            '_' | 'a'..='z' | 'A'..='Z' => true,
+            '-' | '_' | 'a'..='z' | 'A'..='Z' => true,
             _ => self.is_non_ascii() || self.is_escape(),
         }
     }
diff --git a/tests/warnings.rs b/tests/warnings.rs
index f160ddb..a2fef48 100644
--- a/tests/warnings.rs
+++ b/tests/warnings.rs
@@ -4,24 +4,17 @@
 //! Warnings
 
 fn run_process(input: &str) -> String {
-    use std::io::Write;
     use std::process::Stdio;
 
-    let mut child = std::process::Command::new("target/debug/examples/parse")
+    let child = std::process::Command::new("target/debug/examples/parse")
         .arg("-")
+        .arg(input)
         .stdin(Stdio::piped())
         .stdout(Stdio::null())
         .stderr(Stdio::piped())
         .spawn()
         .unwrap();
 
-    child
-        .stdin
-        .as_mut()
-        .unwrap()
-        .write_all(input.as_bytes())
-        .unwrap();
-
     let output = child.wait_with_output().expect("Failed to read stdout");
     String::from_utf8(output.stderr).unwrap()
 }