feat: implement global and Asia-focused SEO & localization optimizations

desktop-app/package.json

@@ -2,7 +2,7 @@
   "name": "markdown-viewer-desktop",
   "version": "1.0.0",
   "private": true,
-  "description": "Neutralinojs desktop port of Markdown Viewer",
+  "description": "A premium client-side GitHub-style Markdown editor and live preview tool for desktop, featuring math rendering, diagrams, syntax highlighting, and PDF/HTML exports.",
   "scripts": {
     "setup": "node setup-binaries.js",
     "postsetup": "node prepare.js",

index.html

@@ -9,6 +9,23 @@
     <link rel="dns-prefetch" href="https://cdnjs.cloudflare.com">
     <link rel="dns-prefetch" href="https://cdn.jsdelivr.net">
 
+    <!-- Canonical Link -->
+    <link rel="canonical" href="https://markdownviewer.pages.dev/">
+
+    <!-- Multilingual Hreflang Tags for Search Crawlers -->
+    <link rel="alternate" hreflang="x-default" href="https://markdownviewer.pages.dev/" />
+    <link rel="alternate" hreflang="en" href="https://markdownviewer.pages.dev/?lang=en" />
+    <link rel="alternate" hreflang="zh-Hans" href="https://markdownviewer.pages.dev/?lang=zh" />
+    <link rel="alternate" hreflang="ja" href="https://markdownviewer.pages.dev/?lang=ja" />
+    <link rel="alternate" hreflang="ko" href="https://markdownviewer.pages.dev/?lang=ko" />
+
+    <!-- Asian Search Engine Verification Meta Tags -->
+    <meta name="baidu-site-verification" content="baidu_verification_code_placeholder" />
+    <meta name="naver-site-verification" content="naver_verification_code_placeholder" />
+
+    <!-- PWA Web Manifest -->
+    <link rel="manifest" href="manifest.json">
+
     <!-- Primary Meta Tags -->
     <meta name="title" content="Markdown Viewer">
     <meta name="description" content="Markdown Viewer is a powerful GitHub-style Markdown rendering tool with live preview, LaTeX math, Mermaid diagrams, syntax highlighting, dark mode, and export options to PDF, HTML, and MD—all fully client-side and secure.">
@@ -33,6 +50,31 @@
     <meta property="twitter:description" content="Markdown Viewer is a powerful GitHub-style Markdown rendering tool with live preview, LaTeX math, Mermaid diagrams, syntax highlighting, dark mode, and export options to PDF, HTML, and MD—all fully client-side and secure.">
     <meta property="twitter:image" content="https://markdownviewer.pages.dev/assets/icon.jpg">
 
+    <!-- JSON-LD Structured Data Schema for Search Rich Snippets -->
+    <script type="application/ld+json">
+    {
+      "@context": "https://schema.org",
+      "@type": "WebApplication",
+      "name": "Markdown Viewer",
+      "url": "https://markdownviewer.pages.dev/",
+      "image": "https://markdownviewer.pages.dev/assets/icon.jpg",
+      "description": "A powerful GitHub-style Markdown rendering tool with live preview, LaTeX, Mermaid, syntax highlighting, and PDF export.",
+      "applicationCategory": "DeveloperApplication",
+      "operatingSystem": "All",
+      "browserRequirements": "Requires HTML5 compatible browser",
+      "author": {
+        "@type": "Organization",
+        "name": "ThisIs-Developer",
+        "url": "https://github.com/ThisIs-Developer"
+      },
+      "offers": {
+        "@type": "Offer",
+        "price": "0.00",
+        "priceCurrency": "USD"
+      }
+    }
+    </script>
+
     <title>Markdown Viewer</title>
     <link href="assets/icon.jpg" rel="icon" type="image/jpg">
     <!-- Updated libraries to latest versions with Subresource Integrity (SRI) -->
@@ -78,13 +120,13 @@ <h1 class="h4 mb-0 me-2">Markdown Viewer</h1>
                     </a>
                     <div id="stats-container" class="stats-container d-flex align-items-center d-none d-md-flex">
                         <div class="stat-item me-3">
-                            <i class="bi bi-clock me-1"></i> <span id="reading-time">0</span> Min Read
+                            <i class="bi bi-clock me-1"></i> <span id="reading-time">0</span> <span id="lbl-min-read">Min Read</span>
                         </div>
                         <div class="stat-item me-3">
-                            <i class="bi bi-text-paragraph me-1"></i> <span id="word-count">0</span> Words
+                            <i class="bi bi-text-paragraph me-1"></i> <span id="word-count">0</span> <span id="lbl-words">Words</span>
                         </div>
                         <div class="stat-item">
-                            <i class="bi bi-fonts me-1"></i> <span id="char-count">0</span> Chars
+                            <i class="bi bi-fonts me-1"></i> <span id="char-count">0</span> <span id="lbl-chars">Chars</span>
                         </div>
                     </div>
                 </div>
@@ -136,6 +178,18 @@ <h1 class="h4 mb-0 me-2">Markdown Viewer</h1>
                         <i class="bi bi-share"></i> <span class="btn-text">Share</span>
                     </button>
 
+                    <div class="dropdown me-1">
+                        <button class="tool-button dropdown-toggle" type="button" id="languageDropdown" data-bs-toggle="dropdown" aria-expanded="false" title="Switch Language">
+                            <i class="bi bi-translate"></i> <span id="current-lang-label" class="btn-text">English</span>
+                        </button>
+                        <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="languageDropdown">
+                            <li><a class="dropdown-item lang-select-item active" href="#" data-lang="en">🇺🇸 English</a></li>
+                            <li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
+                            <li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
+                            <li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
+                        </ul>
+                    </div>
+
                     <button id="theme-toggle" class="tool-button" title="Toggle Dark Mode">
                         <i class="bi bi-moon"></i>
                     </button>
@@ -189,13 +243,13 @@ <h5>Menu</h5>
 
                         <div class="mobile-stats-container mb-3">
                             <div class="stat-item mb-2">
-                                <i class="bi bi-clock me-1"></i> <span id="mobile-reading-time">0</span> Min Read
+                                <i class="bi bi-clock me-1"></i> <span id="mobile-reading-time">0</span> <span id="lbl-mobile-min-read">Min Read</span>
                             </div>
                             <div class="stat-item mb-2">
-                                <i class="bi bi-text-paragraph me-1"></i> <span id="mobile-word-count">0</span> Words
+                                <i class="bi bi-text-paragraph me-1"></i> <span id="mobile-word-count">0</span> <span id="lbl-mobile-words">Words</span>
                             </div>
                             <div class="stat-item">
-                                <i class="bi bi-fonts me-1"></i> <span id="mobile-char-count">0</span> Chars
+                                <i class="bi bi-fonts me-1"></i> <span id="mobile-char-count">0</span> <span id="lbl-mobile-chars">Chars</span>
                             </div>
                         </div>
 
@@ -235,6 +289,17 @@ <h5>Menu</h5>
                             <button id="mobile-direction-toggle" class="mobile-menu-item" title="Toggle RTL/LTR">
                                 <i class="bi bi-text-right me-2"></i> Switch to RTL
                             </button>
+                            <div class="mobile-menu-item dropdown w-100 p-0 border-0">
+                                <button class="mobile-menu-item w-100 text-start dropdown-toggle" type="button" id="mobileLanguageDropdown" data-bs-toggle="dropdown" aria-expanded="false" title="Switch Language">
+                                    <i class="bi bi-translate me-2"></i> Language: <span id="mobile-current-lang-label">English</span>
+                                </button>
+                                <ul class="dropdown-menu w-100" aria-labelledby="mobileLanguageDropdown">
+                                    <li><a class="dropdown-item lang-select-item active" href="#" data-lang="en">🇺🇸 English</a></li>
+                                    <li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
+                                    <li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
+                                    <li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
+                                </ul>
+                            </div>
                             <button id="mobile-theme-toggle" class="mobile-menu-item" title="Toggle Dark Mode">
                                 <i class="bi bi-moon me-2"></i> Dark Mode
                             </button>

manifest.json

@@ -0,0 +1,18 @@
+{
+  "name": "Markdown Viewer",
+  "short_name": "MD Viewer",
+  "description": "A premium client-side GitHub-style Markdown editor and live preview tool.",
+  "start_url": "./index.html?utm_source=pwa",
+  "display": "standalone",
+  "background_color": "#0d1117",
+  "theme_color": "#0d1117",
+  "orientation": "any",
+  "icons": [
+    {
+      "src": "assets/icon.jpg",
+      "sizes": "512x512",
+      "type": "image/jpeg",
+      "purpose": "any maskable"
+    }
+  ]
+}

robots.txt

@@ -0,0 +1,5 @@
+User-agent: *
+Allow: /
+Disallow: /wiki/Contributing
+
+Sitemap: https://markdownviewer.pages.dev/sitemap.xml