diff --git a/apps/desktop/electron/main/browser-view.ts b/apps/desktop/electron/main/browser-view.ts
index 48c2af1d6..12fafc59d 100644
--- a/apps/desktop/electron/main/browser-view.ts
+++ b/apps/desktop/electron/main/browser-view.ts
@@ -25,7 +25,12 @@ const LIVE_RELOAD_DEBOUNCE_MS = 250;
 export function normalizeUrl(raw: string): string | null {
   const trimmed = raw.trim();
   if (!trimmed) return null;
-  const withScheme = /^[a-zA-Z][a-zA-Z0-9+.-]*:/.test(trimmed)
+  const hasScheme = /^[a-zA-Z][a-zA-Z0-9+.-]*:/.test(trimmed);
+  // A dotted hostname or localhost followed by a numeric port is an HTTP
+  // address, not a custom scheme. Keep other schemes subject to the allowlist.
+  const hasHostPort =
+    /^(?:localhost|(?:[a-zA-Z0-9-]+\.)+[a-zA-Z0-9-]+):\d+(?:[/?#]|$)/i.test(trimmed);
+  const withScheme = hasScheme && !hasHostPort
     ? trimmed
     : `http://${trimmed}`;
   try {
@@ -53,8 +58,8 @@ function isWithinRoot(path: string, root: string): boolean {
  * Resolve user input to a previewable file inside the workspace: a file://
  * URL, an absolute path, or a workspace-relative path (./demo/index.html,
  * index.html). Returns null unless the target exists as a file within the
- * root — inputs like "localhost:3000/a.html" then fall through to URL
- * handling instead of a broken file load.
+ * root. A missing relative file (for example, "localhost:3000/a.html")
+ * returns null so the caller can try HTTP URL normalization.
  */
 export function resolveLocalFile(raw: string, root: string | null): string | null {
   const trimmed = raw.trim();
diff --git a/apps/desktop/test/browser-pane-navigation.test.mjs b/apps/desktop/test/browser-pane-navigation.test.mjs
index e8a57d6d1..21ceae7de 100644
--- a/apps/desktop/test/browser-pane-navigation.test.mjs
+++ b/apps/desktop/test/browser-pane-navigation.test.mjs
@@ -1,5 +1,7 @@
 import assert from "node:assert/strict";
 import { register, registerHooks } from "node:module";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import test from "node:test";
 
 // Electron is the external boundary; all navigation and timeout logic below
@@ -35,7 +37,7 @@ registerHooks({ resolve(specifier, context, next) {
   return specifier === "electron" ? { url: electron, shortCircuit: true } : next(specifier, context);
 } });
 register(new URL("./helpers/ts-import-hooks.mjs", import.meta.url));
-const { BrowserPane } = await import("../electron/main/browser-view.ts");
+const { BrowserPane, normalizeUrl } = await import("../electron/main/browser-view.ts");
 const { WebContentsView } = await import("electron");
 const settled = () => new Promise(setImmediate);
 
@@ -48,6 +50,33 @@ function harness(t) {
   return { pane, wc, request };
 }
 
+test("address-bar host and port inputs normalize to HTTP without accepting other schemes", () => {
+  assert.equal(normalizeUrl("localhost:3000"), "http://localhost:3000/");
+  assert.equal(normalizeUrl("localhost:3000/index.html"), "http://localhost:3000/index.html");
+  assert.equal(normalizeUrl("example.com:8080"), "http://example.com:8080/");
+  assert.equal(normalizeUrl("127.0.0.1:3000"), "http://127.0.0.1:3000/");
+  assert.equal(normalizeUrl("example.com"), "http://example.com/");
+  assert.equal(normalizeUrl("http://localhost:3000/index.html"), "http://localhost:3000/index.html");
+  assert.equal(normalizeUrl("file:///tmp/demo.html"), null);
+  assert.equal(normalizeUrl("javascript:alert(1)"), null);
+  assert.equal(normalizeUrl("custom:8080"), null);
+});
+
+test("submitting a localhost address with a workspace root loads and publishes the HTTP URL", async (t) => {
+  const { mkdtempSync, rmSync } = await import("node:fs");
+  const root = mkdtempSync(join(tmpdir(), "browser-host-port-"));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  const published = [];
+  const pane = new BrowserPane((state) => published.push(state));
+  const request = pane.navigateAndWait("localhost:3000/index.html", root);
+  const wc = WebContentsView.instances.at(-1).webContents;
+  assert.equal(wc.pendingLoads[0].url, "http://localhost:3000/index.html");
+  assert.equal(published.at(-1).url, "http://localhost:3000/index.html");
+  wc.url = "http://localhost:3000/index.html";
+  wc.pendingLoads.shift().resolve();
+  assert.equal((await request).url, "http://localhost:3000/index.html");
+});
+
 test("timing out a new preview does not return the previous document as ready", async (t) => {
   const { request, wc } = harness(t);
   wc.pendingLoads[0].resolve(); // An old document finishing cannot satisfy this load.
diff --git a/docs/spec/04-ux/08-component-spec.md b/docs/spec/04-ux/08-component-spec.md
index e4353c914..ec14dab95 100644
--- a/docs/spec/04-ux/08-component-spec.md
+++ b/docs/spec/04-ux/08-component-spec.md
@@ -1063,6 +1063,12 @@ entirely inside the plugin's isolated page:
   main-frame wait shows a retryable error, with the old guest hidden. Superseded
   and cancelled requests cannot publish over the new navigation.
 
+- Browser address input accepts HTTP(S) URLs and scheme-less web hosts. A
+  `localhost` or dotted hostname followed by a numeric port (for example,
+  `localhost:3000/index.html` or `example.com:8080`) is treated as an HTTP
+  address rather than a custom URL scheme. Unsupported schemes remain blocked;
+  workspace file previews continue to use the in-root file path gate.
+
 - Opening an HTTP(S) link in the work panel creates an additional Browser
   resource tab instead of replacing the previous URL. Each tab owns a host-retained WebContents, address, title and navigation
   history. Switching hides/shows pages without reloading, preserving live form,
diff --git a/docs/spec/06-delivery/04-e2e-test-plan.md b/docs/spec/06-delivery/04-e2e-test-plan.md
index 78b0f169f..12b85838e 100644
--- a/docs/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/spec/06-delivery/04-e2e-test-plan.md
@@ -3766,7 +3766,10 @@ identify the platform validation still needed.
 #### E2E-059: Embedded browser preview isolation and overlays
 
 - **Preconditions**: A local dev server is running; a URL or BrowserPreview artifact exists.
-- **Steps**: 1) Activate the artifact, enter `localhost:<port>` without a scheme, and submit.
+- **Steps**: 1) Activate the artifact, enter `localhost:<port>` and
+  `localhost:<port>/index.html` without a scheme, and submit each. Enter a
+  dotted host with a port (for example, `example.com:8080`), then verify an
+  explicit HTTP(S) URL and a rejected `javascript:` URL.
   2) Navigate site links; use back/forward/reload/stop. 3) Trigger a
   `window.open` popup and a permission-requesting page (e.g. notification
   prompt). 4) Open global search, then rename a session from the left sidebar;
diff --git a/docs/zh-CN/spec/04-ux/08-component-spec.md b/docs/zh-CN/spec/04-ux/08-component-spec.md
index 2d0621f10..3de282315 100644
--- a/docs/zh-CN/spec/04-ux/08-component-spec.md
+++ b/docs/zh-CN/spec/04-ux/08-component-spec.md
@@ -772,6 +772,11 @@ vendor 进来的 `pi.file-manager` 视图在插件自己的隔离页面内完成
   导航失败或主框架等待超过 15 秒时显示可重试的错误，并隐藏旧页面；
   被替代或取消的请求不得覆盖新导航。
 
+- 浏览器地址栏接受 HTTP(S) URL 和省略协议的网页主机。`localhost` 或点分主机名
+  后接数字端口时（如 `localhost:3000/index.html`、`example.com:8080`），
+  按 HTTP 地址处理，而不是误认为自定义 scheme。不支持的 scheme 仍会被拒绝；
+  工作区文件预览继续使用根目录范围校验。
+
 - 在工作面板中打开 HTTP(S) 链接会新增浏览器资源标签，不覆盖原网址。
   每个标签保留自己的 WebContents、地址、标题及浏览历史。切换只隐藏/显示页面，
   保留当前表单、滚动位置和 JavaScript 状态；后台页面启用节流。关闭标签释放页面和 CDP 资源，
diff --git a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
index 5eb4f4533..5c64b1bc3 100644
--- a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
@@ -2271,7 +2271,9 @@ MainChat 弥补了缺口。 Maximized/fullscreen 调用保留最新的
 #### E2E-059：嵌入式浏览器预览隔离和覆盖
 
 - **前提条件**：本地开发服务器正在运行；存在 URL 或 BrowserPreview 工件。
-- **步骤**： 1) 激活工件，输入 `localhost:<port>`（不带方案），然后提交。
+- **步骤**： 1) 激活工件，依次输入不带协议的 `localhost:<port>` 和
+  `localhost:<port>/index.html` 并提交；再输入带端口的点分主机名
+  （如 `example.com:8080`），验证显式 HTTP(S) 地址及被拒绝的 `javascript:` 地址。
   2) 导航站点链接；使用 back/forward/reload/stop。 3) 触发
   `window.open` 弹出窗口和权限请求页面（例如通知
   提示）。 4) 打开全局搜索，然后打开设置。返回聊天