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Global Selection Style

Set custom styles for text selection across all websites, only if not already defined

  1. // ==UserScript==
  2. // @name         Global Selection Style
  3. // @namespace    http://tampermonkey.net/
  4. // @version      1.0
  5. // @description  Set custom styles for text selection across all websites, only if not already defined
  6. // @author       jhll1124
  7. // @match        *://*/*
  8. // @exclude      *://www.bilibili.com/*  // 排除B站
  9. // @grant        GM_addStyle
  10. // @license      MIT
  11. // ==/UserScript==
  12.  
  13. (function() {
  14.     'use strict';
  15.  
  16.     const targetSelectors = [
  17.         '::selection',
  18.         '*::selection',
  19.         'body::selection',
  20.         'html::selection'
  21.     ];
  22.  
  23.     let found = false;
  24.  
  25.     for (const sheet of document.styleSheets) {
  26.         try {
  27.             const rules = sheet.cssRules;
  28.             if (!rules) continue;
  29.  
  30.             for (const rule of rules) {
  31.                 if (rule.selectorText && targetSelectors.some(sel => rule.selectorText.includes(sel))) {
  32.                     found = true;
  33.                     break;
  34.                 }
  35.             }
  36.         } catch (e) {
  37.             // 忽略跨域样式表
  38.         }
  39.         if (found) break;
  40.     }
  41.  
  42.     if (!found) {
  43.         GM_addStyle(`
  44.             ::selection {
  45.                 background-color: rgb(242, 198, 255);
  46.             }
  47.         `);
  48.     }
  49. })();