feat: Restore CSS injection functionality

src/libs/rules.js

@@ -58,7 +58,7 @@ export const matchRule = async (href, { injectRules, subrulesList }) => {
     "parentStyle",
     "grandStyle",
     "injectJs",
-    // "injectCss",
+    "injectCss",
     "transStartHook",
     "transEndHook",
     // "transRemoveHook",
@@ -138,7 +138,7 @@ export const checkRules = (rules) => {
         parentStyle,
         grandStyle,
         injectJs,
-        // injectCss,
+        injectCss,
         apiSlug,
         fromLang,
         toLang,
@@ -171,7 +171,7 @@ export const checkRules = (rules) => {
         parentStyle: type(parentStyle) === "string" ? parentStyle : "",
         grandStyle: type(grandStyle) === "string" ? grandStyle : "",
         injectJs: type(injectJs) === "string" ? injectJs : "",
-        // injectCss: type(injectCss) === "string" ? injectCss : "",
+        injectCss: type(injectCss) === "string" ? injectCss : "",
         apiSlug:
           type(apiSlug) === "string" && apiSlug.trim() !== ""
             ? apiSlug.trim()

src/libs/translator.js

@@ -13,6 +13,7 @@ import {
   OPT_SPLIT_PARAGRAPH_PUNCTUATION,
   OPT_SPLIT_PARAGRAPH_DISABLE,
   OPT_SPLIT_PARAGRAPH_TEXTLENGTH,
+  MSG_INJECT_CSS,
 } from "../config";
 import { interpreter } from "./interpreter";
 import { clearFetchPool } from "./pool";
@@ -26,6 +27,9 @@ import { shortcutRegister } from "./shortcut";
 import { tryDetectLang } from "./detect";
 import { trustedTypesHelper } from "./trustedTypes";
 import { injectJs, INJECTOR } from "../injectors";
+import { injectInternalCss } from "./injector";
+import { isExt } from "./client";
+import { sendBgMsg } from "./msg";
 
 /**
  * @class Translator
@@ -1624,7 +1628,14 @@ export class Translator {
       //   injectCss && injectInternalCss(injectCss);
       // }
 
-      const { injectJs, toLang } = this.#rule;
+      const { injectJs, injectCss, toLang } = this.#rule;
+
+      if (isExt) {
+        injectCss && sendBgMsg(MSG_INJECT_CSS, injectCss);
+      } else {
+        injectCss && injectInternalCss(injectCss);
+      }
+
       if (injectJs?.trim()) {
         const apiSetting = { ...this.#apiSetting };
         const docInfo = { ...this.#docInfo };