feat(css/parser): Improve error reporting (#6274)

crates/swc_css_parser/src/parser/selectors/mod.rs

@@ -403,8 +403,8 @@ where
     I: ParserInput,
 {
     fn parse(&mut self) -> PResult<CompoundSelector> {
-        let span = self.input.cur_span();
-        let start_pos = span.lo;
+        let start_span = self.input.cur_span();
+        let start_pos = start_span.lo;
 
         let mut nesting_selector = None;
 
@@ -459,12 +459,12 @@ where
             }
         }
 
-        let span = span!(self, start_pos);
-
         if nesting_selector.is_none() && type_selector.is_none() && subclass_selectors.is_empty() {
-            return Err(Error::new(span, ErrorKind::InvalidSelector));
+            return Err(Error::new(start_span, ErrorKind::InvalidSelector));
         }
 
+        let span = span!(self, start_pos);
+
         Ok(CompoundSelector {
             span,
             nesting_selector,

crates/swc_css_parser/tests/fixture.rs

@@ -581,11 +581,8 @@ fn span_visualizer_line_comment(input: PathBuf) {
 #[testing::fixture(
     "tests/recovery/**/input.css",
     exclude(
-        "at-rule/media/condition/input.css",
-        "at-rule/media/condition-1/input.css",
         "at-rule/page/invalid-nesting/input.css",
         "at-rule/page/without-page/input.css",
-        "at-rule/unknown/input.css",
         "function/calc/division/input.css",
         "function/calc/space/input.css",
         "function/var/input.css",