docs: clarification about trailing slash in docs (#11326)

Fixes #10557

docs/src/api/class-apirequest.md

@@ -31,6 +31,7 @@ Maximum time in milliseconds to wait for the response. Defaults to
 Methods like [`method: APIRequestContext.get`] take the base URL into consideration by using the [`URL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL/URL) constructor for building the corresponding URL. Examples:
 * baseURL: `http://localhost:3000` and sending request to `/bar.html` results in `http://localhost:3000/bar.html`
 * baseURL: `http://localhost:3000/foo/` and sending request to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+* baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in `http://localhost:3000/bar.html`
 
 ### option: APIRequest.newContext.storageState
 * langs: js, python

docs/src/api/params.md

@@ -268,6 +268,7 @@ Toggles bypassing page's Content-Security-Policy.
 When using [`method: Page.goto`], [`method: Page.route`], [`method: Page.waitForURL`], [`method: Page.waitForRequest`], or [`method: Page.waitForResponse`] it takes the base URL in consideration by using the [`URL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL/URL) constructor for building the corresponding URL. Examples:
 * baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
 * baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+* baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in `http://localhost:3000/bar.html`
 
 ## context-option-viewport
 * langs: js, java

packages/playwright-core/types/types.d.ts

@@ -9906,6 +9906,8 @@ export interface BrowserType<Unused = {}> {
      * constructor for building the corresponding URL. Examples:
      * - baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
      * - baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+     * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+     *   `http://localhost:3000/bar.html`
      */
     baseURL?: string;
 
@@ -11128,6 +11130,8 @@ export interface AndroidDevice {
      * constructor for building the corresponding URL. Examples:
      * - baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
      * - baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+     * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+     *   `http://localhost:3000/bar.html`
      */
     baseURL?: string;
 
@@ -11797,6 +11801,8 @@ export interface APIRequest {
      * - baseURL: `http://localhost:3000` and sending request to `/bar.html` results in `http://localhost:3000/bar.html`
      * - baseURL: `http://localhost:3000/foo/` and sending request to `./bar.html` results in
      *   `http://localhost:3000/foo/bar.html`
+     * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+     *   `http://localhost:3000/bar.html`
      */
     baseURL?: string;
 
@@ -12595,6 +12601,8 @@ export interface Browser extends EventEmitter {
      * constructor for building the corresponding URL. Examples:
      * - baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
      * - baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+     * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+     *   `http://localhost:3000/bar.html`
      */
     baseURL?: string;
 
@@ -15002,6 +15010,8 @@ export interface BrowserContextOptions {
    * constructor for building the corresponding URL. Examples:
    * - baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
    * - baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+   * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+   *   `http://localhost:3000/bar.html`
    */
   baseURL?: string;
 

packages/playwright-test/types/test.d.ts

@@ -2860,6 +2860,8 @@ export interface PlaywrightTestOptions {
    * constructor for building the corresponding URL. Examples:
    * - baseURL: `http://localhost:3000` and navigating to `/bar.html` results in `http://localhost:3000/bar.html`
    * - baseURL: `http://localhost:3000/foo/` and navigating to `./bar.html` results in `http://localhost:3000/foo/bar.html`
+   * - baseURL: `http://localhost:3000/foo` (without trailing slash) and navigating to `./bar.html` results in
+   *   `http://localhost:3000/bar.html`
    */
   baseURL: string | undefined;
   /**