---
source: crates/biome_formatter_test/src/snapshot_builder.rs
info: css/front-matter/custom-parser.css
---

# Input

```css
---mycustomparser
title: Title
description: Description
---
/* comment */
.something 
{}

```


# Prettier differences

```diff
--- Prettier
+++ Biome
@@ -1,8 +1,9 @@
----mycustomparser
+-
+--mycustomparser
 title: Title
 description: Description
----
-
+--
+-
 /* comment */
 .something {
 }
```

# Output

```css
-
--mycustomparser
title: Title
description: Description
--
-
/* comment */
.something {
}
```

# Errors
```
custom-parser.css:1:1 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected a qualified rule, or an at rule but instead found '-'.
  
  > 1 │ ---mycustomparser
      │ ^
    2 │ title: Title
    3 │ description: Description
  
  i Expected a qualified rule, or an at rule here.
  
  > 1 │ ---mycustomparser
      │ ^
    2 │ title: Title
    3 │ description: Description
  
custom-parser.css:2:1 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `title`
  
    1 │ ---mycustomparser
  > 2 │ title: Title
      │ ^^^^^
    3 │ description: Description
    4 │ ---
  
  i Remove title
  
custom-parser.css:3:1 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `description`
  
    1 │ ---mycustomparser
    2 │ title: Title
  > 3 │ description: Description
      │ ^^^^^^^^^^^
    4 │ ---
    5 │ /* comment */
  
  i Remove description
  
custom-parser.css:4:1 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `-`
  
    2 │ title: Title
    3 │ description: Description
  > 4 │ ---
      │ ^
    5 │ /* comment */
    6 │ .something·
  
  i Remove -
  
custom-parser.css:4:3 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `-`
  
    2 │ title: Title
    3 │ description: Description
  > 4 │ ---
      │   ^
    5 │ /* comment */
    6 │ .something·
  
  i Remove -
  

```