diff --git a/.prettierrc b/.prettierrc
index 6b51545e..d0308401 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -2,5 +2,6 @@
   "useTabs": false,
   "singleQuote": true,
   "trailingComma": "es5",
-  "printWidth": 80
+  "printWidth": 80,
+  "svelteStrictMode": true
 }
diff --git a/react/package-lock.json b/react/package-lock.json
index 88c71ca5..00fe3247 100644
--- a/react/package-lock.json
+++ b/react/package-lock.json
@@ -1,14 +1,14 @@
 {
   "name": "@giscus/react",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@giscus/react",
-      "version": "2.2.8",
+      "version": "2.3.0",
       "dependencies": {
-        "giscus": "^1.2.8"
+        "giscus": "^1.3.0"
       },
       "devDependencies": {
         "@rollup/plugin-typescript": "^11.1.1",
@@ -2377,11 +2377,11 @@
       }
     },
     "node_modules/giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "dependencies": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "node_modules/glob": {
@@ -5665,11 +5665,11 @@
       }
     },
     "giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "requires": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "glob": {
diff --git a/react/package.json b/react/package.json
index 9e007d3f..faabd79e 100644
--- a/react/package.json
+++ b/react/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@giscus/react",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "main": "dist/index.js",
   "module": "dist/wrapper.mjs",
   "types": "dist/index.d.ts",
@@ -29,7 +29,7 @@
     "format:fix": "prettier src --write"
   },
   "dependencies": {
-    "giscus": "^1.2.8"
+    "giscus": "^1.3.0"
   },
   "peerDependencies": {
     "react": "^16 || ^17 || ^18",
diff --git a/react/src/lib/types.ts b/react/src/lib/types.ts
index 0b5ac57d..266e4a4d 100644
--- a/react/src/lib/types.ts
+++ b/react/src/lib/types.ts
@@ -24,17 +24,23 @@ export type Theme =
   | 'dark_protanopia'
   | 'dark_tritanopia'
   | 'dark_dimmed'
-  | 'transparent_dark'
   | 'preferred_color_scheme'
+  | 'transparent_dark'
+  | 'noborder_light'
+  | 'noborder_dark'
+  | 'cobalt'
   | `https://${string}`
   | GenericString;
 
 export type AvailableLanguage =
+  | 'ar'
+  | 'ca'
   | 'de'
-  | 'gsw'
   | 'en'
   | 'es'
+  | 'fa'
   | 'fr'
+  | 'he'
   | 'id'
   | 'it'
   | 'ja'
@@ -44,8 +50,10 @@ export type AvailableLanguage =
   | 'pt'
   | 'ro'
   | 'ru'
+  | 'th'
   | 'tr'
   | 'vi'
+  | 'uk'
   | 'zh-CN'
   | 'zh-TW'
   | GenericString;
diff --git a/solid/package-lock.json b/solid/package-lock.json
index 86319396..ca8ea5d8 100644
--- a/solid/package-lock.json
+++ b/solid/package-lock.json
@@ -1,14 +1,14 @@
 {
   "name": "@giscus/solid",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@giscus/solid",
-      "version": "2.2.8",
+      "version": "2.3.0",
       "dependencies": {
-        "giscus": "^1.2.8"
+        "giscus": "^1.3.0"
       },
       "devDependencies": {
         "@rollup/plugin-typescript": "^11.1.2",
@@ -2490,11 +2490,11 @@
       }
     },
     "node_modules/giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "dependencies": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "node_modules/glob": {
@@ -5881,11 +5881,11 @@
       }
     },
     "giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "requires": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "glob": {
diff --git a/solid/package.json b/solid/package.json
index 67ef466b..3f4697a3 100644
--- a/solid/package.json
+++ b/solid/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@giscus/solid",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "main": "dist/index.js",
   "module": "dist/wrapper.mjs",
   "types": "dist/index.d.ts",
@@ -29,7 +29,7 @@
     "format:fix": "prettier src --write"
   },
   "dependencies": {
-    "giscus": "^1.2.8"
+    "giscus": "^1.3.0"
   },
   "peerDependencies": {
     "solid-js": "^1.3 || ^1.4 || ^1.5 || ^1.6"
diff --git a/solid/src/lib/types.ts b/solid/src/lib/types.ts
index 0b5ac57d..266e4a4d 100644
--- a/solid/src/lib/types.ts
+++ b/solid/src/lib/types.ts
@@ -24,17 +24,23 @@ export type Theme =
   | 'dark_protanopia'
   | 'dark_tritanopia'
   | 'dark_dimmed'
-  | 'transparent_dark'
   | 'preferred_color_scheme'
+  | 'transparent_dark'
+  | 'noborder_light'
+  | 'noborder_dark'
+  | 'cobalt'
   | `https://${string}`
   | GenericString;
 
 export type AvailableLanguage =
+  | 'ar'
+  | 'ca'
   | 'de'
-  | 'gsw'
   | 'en'
   | 'es'
+  | 'fa'
   | 'fr'
+  | 'he'
   | 'id'
   | 'it'
   | 'ja'
@@ -44,8 +50,10 @@ export type AvailableLanguage =
   | 'pt'
   | 'ro'
   | 'ru'
+  | 'th'
   | 'tr'
   | 'vi'
+  | 'uk'
   | 'zh-CN'
   | 'zh-TW'
   | GenericString;
diff --git a/svelte/package-lock.json b/svelte/package-lock.json
index 35a89ae5..1fe88882 100644
--- a/svelte/package-lock.json
+++ b/svelte/package-lock.json
@@ -1,14 +1,14 @@
 {
   "name": "@giscus/svelte",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@giscus/svelte",
-      "version": "2.2.8",
+      "version": "2.3.0",
       "dependencies": {
-        "giscus": "^1.2.8"
+        "giscus": "^1.3.0"
       },
       "devDependencies": {
         "@sveltejs/adapter-auto": "^2.1.0",
@@ -30,7 +30,7 @@
         "vite": "^4.3.9"
       },
       "peerDependencies": {
-        "svelte": "^3"
+        "svelte": "^3 || ^4"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -1612,11 +1612,11 @@
       }
     },
     "node_modules/giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "dependencies": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "node_modules/glob": {
@@ -3974,11 +3974,11 @@
       "optional": true
     },
     "giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "requires": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "glob": {
diff --git a/svelte/package.json b/svelte/package.json
index c8cce697..84e007f5 100644
--- a/svelte/package.json
+++ b/svelte/package.json
@@ -1,7 +1,6 @@
 {
   "name": "@giscus/svelte",
-  "version": "2.2.8",
-  "types": "./index.d.ts",
+  "version": "2.3.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/giscus/giscus-component.git",
@@ -38,10 +37,10 @@
   },
   "type": "module",
   "dependencies": {
-    "giscus": "^1.2.8"
+    "giscus": "^1.3.0"
   },
   "peerDependencies": {
-    "svelte": "^3"
+    "svelte": "^3 || ^4"
   },
   "exports": {
     "./package.json": "./package.json",
@@ -61,5 +60,6 @@
   "files": [
     "package"
   ],
-  "svelte": "./package/index.js"
+  "svelte": "./package/index.js",
+  "types": "./package/index.d.ts"
 }
diff --git a/svelte/src/lib/Giscus.svelte b/svelte/src/lib/Giscus.svelte
index 22e0a051..b37a866e 100644
--- a/svelte/src/lib/Giscus.svelte
+++ b/svelte/src/lib/Giscus.svelte
@@ -35,20 +35,19 @@
 
 {#if mounted}
   <giscus-widget
-    {id}
-    {host}
-    {repo}
-    repoid={repoId}
-    {category}
-    categoryid={categoryId}
-    {mapping}
-    {term}
-    {strict}
-    reactionsenabled={reactionsEnabled}
-    emitmetadata={emitMetadata}
-    inputposition={inputPosition}
-    {theme}
-    {lang}
-    {loading}
-  />
+    id="{id}"
+    host="{host}"
+    repo="{repo}"
+    repoid="{repoId}"
+    category="{category}"
+    categoryid="{categoryId}"
+    mapping="{mapping}"
+    term="{term}"
+    strict="{strict}"
+    reactionsenabled="{reactionsEnabled}"
+    emitmetadata="{emitMetadata}"
+    inputposition="{inputPosition}"
+    theme="{theme}"
+    lang="{lang}"
+    loading="{loading}"></giscus-widget>
 {/if}
diff --git a/svelte/src/lib/index.ts b/svelte/src/lib/index.ts
index 621d5eb2..f14b660d 100644
--- a/svelte/src/lib/index.ts
+++ b/svelte/src/lib/index.ts
@@ -24,17 +24,23 @@ export type Theme =
   | 'dark_protanopia'
   | 'dark_tritanopia'
   | 'dark_dimmed'
-  | 'transparent_dark'
   | 'preferred_color_scheme'
+  | 'transparent_dark'
+  | 'noborder_light'
+  | 'noborder_dark'
+  | 'cobalt'
   | `https://${string}`
   | GenericString;
 
 export type AvailableLanguage =
+  | 'ar'
+  | 'ca'
   | 'de'
-  | 'gsw'
   | 'en'
   | 'es'
+  | 'fa'
   | 'fr'
+  | 'he'
   | 'id'
   | 'it'
   | 'ja'
@@ -44,8 +50,10 @@ export type AvailableLanguage =
   | 'pt'
   | 'ro'
   | 'ru'
+  | 'th'
   | 'tr'
   | 'vi'
+  | 'uk'
   | 'zh-CN'
   | 'zh-TW'
   | GenericString;
diff --git a/vue/package-lock.json b/vue/package-lock.json
index 7ed9c910..031de591 100644
--- a/vue/package-lock.json
+++ b/vue/package-lock.json
@@ -1,14 +1,14 @@
 {
   "name": "@giscus/vue",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@giscus/vue",
-      "version": "2.2.8",
+      "version": "2.3.0",
       "dependencies": {
-        "giscus": "^1.2.8"
+        "giscus": "^1.3.0"
       },
       "devDependencies": {
         "@types/node": "^18.16.19",
@@ -1608,11 +1608,11 @@
       }
     },
     "node_modules/giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "dependencies": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "node_modules/glob": {
@@ -3734,11 +3734,11 @@
       "optional": true
     },
     "giscus": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.2.8.tgz",
-      "integrity": "sha512-pufrgQYt1W+4ztiWp/PilLPN8NdyKvpbQ8jNqbAa1g84t6qqyevXHfkOYCi4x4d+y191vJAUc6seL1Dq74yUeA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/giscus/-/giscus-1.3.0.tgz",
+      "integrity": "sha512-A3tVLgSmpnh2sX9uGjo9MbzmTTEJirSyFUPRvkipvy37y9rhxUYDoh9kO37QVrP7Sc7QuJ+gihB6apkO0yDyTw==",
       "requires": {
-        "lit": "^2.6.1"
+        "lit": "^2.7.5"
       }
     },
     "glob": {
diff --git a/vue/package.json b/vue/package.json
index 744b0057..97c77458 100644
--- a/vue/package.json
+++ b/vue/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@giscus/vue",
-  "version": "2.2.8",
+  "version": "2.3.0",
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
   "types": "dist/index.d.ts",
@@ -30,7 +30,7 @@
     "format:fix": "prettier src --write"
   },
   "dependencies": {
-    "giscus": "^1.2.8"
+    "giscus": "^1.3.0"
   },
   "peerDependencies": {
     "vue": ">=3.2.0"
diff --git a/vue/src/lib/types.ts b/vue/src/lib/types.ts
index 0b5ac57d..266e4a4d 100644
--- a/vue/src/lib/types.ts
+++ b/vue/src/lib/types.ts
@@ -24,17 +24,23 @@ export type Theme =
   | 'dark_protanopia'
   | 'dark_tritanopia'
   | 'dark_dimmed'
-  | 'transparent_dark'
   | 'preferred_color_scheme'
+  | 'transparent_dark'
+  | 'noborder_light'
+  | 'noborder_dark'
+  | 'cobalt'
   | `https://${string}`
   | GenericString;
 
 export type AvailableLanguage =
+  | 'ar'
+  | 'ca'
   | 'de'
-  | 'gsw'
   | 'en'
   | 'es'
+  | 'fa'
   | 'fr'
+  | 'he'
   | 'id'
   | 'it'
   | 'ja'
@@ -44,8 +50,10 @@ export type AvailableLanguage =
   | 'pt'
   | 'ro'
   | 'ru'
+  | 'th'
   | 'tr'
   | 'vi'
+  | 'uk'
   | 'zh-CN'
   | 'zh-TW'
   | GenericString;
diff --git a/web/package-lock.json b/web/package-lock.json
index 873bf6cd..e0237202 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "giscus",
-  "version": "1.2.8",
+  "version": "1.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "giscus",
-      "version": "1.2.8",
+      "version": "1.3.0",
       "license": "MIT",
       "dependencies": {
         "lit": "^2.7.5"
diff --git a/web/package.json b/web/package.json
index 108045a1..7e2e29de 100644
--- a/web/package.json
+++ b/web/package.json
@@ -1,6 +1,6 @@
 {
   "name": "giscus",
-  "version": "1.2.8",
+  "version": "1.3.0",
   "type": "module",
   "main": "dist/giscus.mjs",
   "module": "dist/giscus.mjs",
diff --git a/web/src/giscus.ts b/web/src/giscus.ts
index 4835b3e7..871ba517 100644
--- a/web/src/giscus.ts
+++ b/web/src/giscus.ts
@@ -2,10 +2,17 @@ import { html, css, LitElement, PropertyDeclaration } from 'lit';
 import { customElement, property } from 'lit/decorators.js';
 import { createRef, ref, Ref } from 'lit/directives/ref.js';
 
+function safeCustomElement(tagName: string) {
+  // Prevents re-registering an element.
+  return customElements.get(tagName)
+    ? (v: ReturnType<ReturnType<typeof customElement>>) => v
+    : customElement(tagName);
+}
+
 /**
  * Widget element for giscus.
  */
-@customElement('giscus-widget')
+@safeCustomElement('giscus-widget')
 export class GiscusWidget extends LitElement {
   private GISCUS_SESSION_KEY = 'giscus-session';
   private GISCUS_DEFAULT_HOST = 'https://giscus.app';
@@ -40,6 +47,17 @@ export class GiscusWidget extends LitElement {
   @property({ reflect: true })
   host: string = this.GISCUS_DEFAULT_HOST;
 
+  get _host() {
+    // Ensure that the host is always a valid URL even if the attribute
+    // has been set to an invalid value.
+    try {
+      new URL(this.host);
+      return this.host;
+    } catch {
+      return this.GISCUS_DEFAULT_HOST;
+    }
+  }
+
   /**
    * Repo where the discussion is stored.
    */
@@ -169,7 +187,7 @@ export class GiscusWidget extends LitElement {
   }
 
   private handleMessageEvent(event: MessageEvent) {
-    if (event.origin !== this.host) return;
+    if (event.origin !== this._host) return;
 
     const { data } = event;
     if (!(typeof data === 'object' && data.giscus)) return;
@@ -220,7 +238,8 @@ export class GiscusWidget extends LitElement {
   private sendMessage<T>(message: T) {
     if (!this.iframeRef || !this.iframeRef.contentWindow || !this.hasLoaded)
       return;
-    this.iframeRef.contentWindow.postMessage({ giscus: message }, this.host);
+    console.log({ host: this.host, _host: this._host });
+    this.iframeRef.contentWindow.postMessage({ giscus: message }, this._host);
   }
 
   private updateConfig() {
@@ -333,7 +352,7 @@ export class GiscusWidget extends LitElement {
       backLink,
     };
 
-    const host = this.host || this.GISCUS_DEFAULT_HOST;
+    const host = this._host;
     const locale = this.lang ? `/${this.lang}` : '';
     const searchParams = new URLSearchParams(params);
 
@@ -388,17 +407,23 @@ type Theme =
   | 'dark_protanopia'
   | 'dark_tritanopia'
   | 'dark_dimmed'
-  | 'transparent_dark'
   | 'preferred_color_scheme'
+  | 'transparent_dark'
+  | 'noborder_light'
+  | 'noborder_dark'
+  | 'cobalt'
   | `https://${string}`
   | GenericString;
 
 type Lang =
+  | 'ar'
+  | 'ca'
   | 'de'
-  | 'gsw'
   | 'en'
   | 'es'
+  | 'fa'
   | 'fr'
+  | 'he'
   | 'id'
   | 'it'
   | 'ja'
@@ -408,8 +433,10 @@ type Lang =
   | 'pt'
   | 'ro'
   | 'ru'
+  | 'th'
   | 'tr'
   | 'vi'
+  | 'uk'
   | 'zh-CN'
   | 'zh-TW'
   | GenericString;