From eb7f8a8bb495beacb9ea632b22cd500298cfe3b3 Mon Sep 17 00:00:00 2001
From: mansiverma897993 <vmansi756@gmail.com>
Date: Wed, 17 Jun 2026 23:23:30 +0530
Subject: [PATCH 1/2] fix: support HTML close comment on the first line of
 script

---
 core/parser/src/lexer/mod.rs                  |  5 ++++
 .../src/parser/cursor/buffered_lexer/mod.rs   |  8 +++--
 .../src/parser/cursor/buffered_lexer/tests.rs | 30 +++++++++++++++++++
 tests/tester/src/exec/mod.rs                  |  1 +
 4 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/core/parser/src/lexer/mod.rs b/core/parser/src/lexer/mod.rs
index 3e493ea800f..fe5edb18f42 100644
--- a/core/parser/src/lexer/mod.rs
+++ b/core/parser/src/lexer/mod.rs
@@ -401,6 +401,11 @@ impl<R> Lexer<R> {
     pub(super) fn take_source(&mut self) -> boa_ast::SourceText {
         self.cursor.take_source()
     }
+
+    /// Gets the current linear position of the lexer.
+    pub(crate) fn linear_pos(&self) -> boa_ast::LinearPosition {
+        self.cursor.linear_pos()
+    }
 }
 
 impl<'a> From<&'a [u8]> for Lexer<UTF8Input<&'a [u8]>> {
diff --git a/core/parser/src/parser/cursor/buffered_lexer/mod.rs b/core/parser/src/parser/cursor/buffered_lexer/mod.rs
index 67ba7aee596..ee84acfe535 100644
--- a/core/parser/src/parser/cursor/buffered_lexer/mod.rs
+++ b/core/parser/src/parser/cursor/buffered_lexer/mod.rs
@@ -133,10 +133,12 @@ where
         );
 
         let previous_index = self.write_index.checked_sub(1).unwrap_or(PEEK_BUF_SIZE - 1);
+        let is_start = self.lexer.linear_pos().pos() == 0;
+        let is_line_terminator = self.peeked[previous_index]
+            .as_ref()
+            .is_some_and(|token| token.kind() == &TokenKind::LineTerminator);
 
-        if let Some(ref token) = self.peeked[previous_index]
-            && token.kind() == &TokenKind::LineTerminator
-        {
+        if is_start || is_line_terminator {
             // We don't want to have multiple contiguous line terminators in the buffer, since
             // they have no meaning.
             let next = loop {
diff --git a/core/parser/src/parser/cursor/buffered_lexer/tests.rs b/core/parser/src/parser/cursor/buffered_lexer/tests.rs
index 7dc8c58ef5b..58d04a169cb 100644
--- a/core/parser/src/parser/cursor/buffered_lexer/tests.rs
+++ b/core/parser/src/parser/cursor/buffered_lexer/tests.rs
@@ -287,3 +287,33 @@ fn issue_1768() {
 
     assert!(cur.peek(3, true, interner).unwrap().is_none());
 }
+
+#[test]
+#[cfg(feature = "annex-b")]
+fn html_close_comment_first_line() {
+    let mut cur = BufferedLexer::from(&b"--> this is a comment\nthrow"[..]);
+    let interner = &mut Interner::default();
+
+    assert_eq!(
+        *cur.next(false, interner)
+            .unwrap()
+            .expect("Some value expected")
+            .kind(),
+        TokenKind::Keyword((boa_ast::Keyword::Throw, false))
+    );
+}
+
+#[test]
+#[cfg(feature = "annex-b")]
+fn html_close_comment_first_line_with_spaces_and_comments() {
+    let mut cur = BufferedLexer::from(&b"  /* comment */ /*another*/--> this is a comment\nthrow"[..]);
+    let interner = &mut Interner::default();
+
+    assert_eq!(
+        *cur.next(false, interner)
+            .unwrap()
+            .expect("Some value expected")
+            .kind(),
+        TokenKind::Keyword((boa_ast::Keyword::Throw, false))
+    );
+}
diff --git a/tests/tester/src/exec/mod.rs b/tests/tester/src/exec/mod.rs
index 62c0afaf5ad..fa78ffc9f10 100644
--- a/tests/tester/src/exec/mod.rs
+++ b/tests/tester/src/exec/mod.rs
@@ -602,6 +602,7 @@ fn is_error_type(error: &JsError, target_type: ErrorType, context: &mut Context)
             JsNativeErrorKind::Reference if target_type == ErrorType::ReferenceError => {}
             JsNativeErrorKind::Range if target_type == ErrorType::RangeError => {}
             JsNativeErrorKind::Type if target_type == ErrorType::TypeError => {}
+            JsNativeErrorKind::Eval if target_type == ErrorType::EvalError => {}
             _ => return false,
         }
         true

From 68f6313c16322603046b455d3156099afeedfe9f Mon Sep 17 00:00:00 2001
From: mansiverma897993 <vmansi756@gmail.com>
Date: Thu, 18 Jun 2026 10:35:59 +0530
Subject: [PATCH 2/2] style: format html_close_comment tests

---
 core/parser/src/parser/cursor/buffered_lexer/tests.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/parser/src/parser/cursor/buffered_lexer/tests.rs b/core/parser/src/parser/cursor/buffered_lexer/tests.rs
index 58d04a169cb..66c69886a75 100644
--- a/core/parser/src/parser/cursor/buffered_lexer/tests.rs
+++ b/core/parser/src/parser/cursor/buffered_lexer/tests.rs
@@ -306,7 +306,8 @@ fn html_close_comment_first_line() {
 #[test]
 #[cfg(feature = "annex-b")]
 fn html_close_comment_first_line_with_spaces_and_comments() {
-    let mut cur = BufferedLexer::from(&b"  /* comment */ /*another*/--> this is a comment\nthrow"[..]);
+    let mut cur =
+        BufferedLexer::from(&b"  /* comment */ /*another*/--> this is a comment\nthrow"[..]);
     let interner = &mut Interner::default();
 
     assert_eq!(