diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/html_renderer/assets.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/html_renderer/assets.rs
index b4c433087..e2c74cb7e 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/html_renderer/assets.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/html_renderer/assets.rs
@@ -54,6 +54,37 @@ pub(super) fn trim_float(value: f32) -> String {
     text.trim_end_matches('0').trim_end_matches('.').to_string()
 }
 
+#[cfg(test)]
+mod tests {
+    use super::font_face_rule;
+    use crate::ui_editor::resource::font::{FontAsset, FontAssetMetadata, FontFormat};
+    use crate::ui_editor::utils::FontAssetId;
+
+    fn font(format: FontFormat) -> FontAsset {
+        FontAsset {
+            asset_id: FontAssetId::new("font-main").expect("valid font id"),
+            metadata: FontAssetMetadata {
+                family_name: "测试字体".to_string(),
+                face_name: "Regular".to_string(),
+                weight: 400,
+                italic: false,
+                format,
+                source_file_name: format!("font.{}", format.extension()),
+            },
+            path: format!("assets/font.{}", format.extension()),
+            content_sha256: "0".repeat(64),
+        }
+    }
+
+    #[test]
+    fn font_face_rule_uses_standard_css_format_names() {
+        let truetype = font_face_rule(&font(FontFormat::TrueType), "ui-font").unwrap();
+        let opentype = font_face_rule(&font(FontFormat::OpenType), "ui-font").unwrap();
+        assert!(truetype.contains("format('truetype')"));
+        assert!(opentype.contains("format('opentype')"));
+    }
+}
+
 pub(super) fn hex_id(value: &str) -> String {
     value
         .as_bytes()