microsoft · yury-s · Jun 6, 2025 · May 30, 2025 · Jun 4, 2025 · Jun 4, 2025
diff --git a/docs/src/api/class-browsercontext.md b/docs/src/api/class-browsercontext.md
@@ -363,6 +363,7 @@ await context.AddCookiesAsync(new[] { cookie1, cookie2 });
   - `httpOnly` ?<[boolean]> Optional.
   - `secure` ?<[boolean]> Optional.
   - `sameSite` ?<[SameSiteAttribute]<"Strict"|"Lax"|"None">> Optional.
+  - `partitionKey` ?<[string]> For partitioned third-party cookies (aka [CHIPS](https://developer.mozilla.org/en-US/docs/Web/Privacy/Guides/Privacy_sandbox/Partitioned_cookies)), the partition key. Optional.
 
 ## async method: BrowserContext.addInitScript
 * since: v1.8
@@ -602,6 +603,7 @@ The default browser context cannot be closed.
   - `httpOnly` <[boolean]>
   - `secure` <[boolean]>
   - `sameSite` <[SameSiteAttribute]<"Strict"|"Lax"|"None">>
+  - `partitionKey` ?<[string]>
 
 If no URLs are specified, this method returns all cookies. If URLs are specified, only cookies that affect those URLs
 are returned.
@@ -1504,6 +1506,7 @@ Whether to emulate network being offline for the browser context.
     - `httpOnly` <[boolean]>
     - `secure` <[boolean]>
     - `sameSite` <[SameSiteAttribute]<"Strict"|"Lax"|"None">>
+    - `partitionKey` ?<[string]>
   - `origins` <[Array]<[Object]>>
     - `origin` <[string]>
     - `localStorage` <[Array]<[Object]>>

diff --git a/packages/playwright-client/types/types.d.ts b/packages/playwright-client/types/types.d.ts
@@ -8830,6 +8830,13 @@ export interface BrowserContext {
      * Optional.
      */
     sameSite?: "Strict"|"Lax"|"None";
+
+    /**
+     * For partitioned third-party cookies (aka
+     * [CHIPS](https://developer.mozilla.org/en-US/docs/Web/Privacy/Guides/Privacy_sandbox/Partitioned_cookies)), the
+     * partition key. Optional.
+     */
+    partitionKey?: string;
   }>): Promise<void>;
 
   /**
@@ -9304,6 +9311,8 @@ export interface BrowserContext {
       secure: boolean;
 
       sameSite: "Strict"|"Lax"|"None";
+
+      partitionKey?: string;
     }>;
 
     origins: Array<{
@@ -22501,6 +22510,8 @@ export interface Cookie {
   secure: boolean;
 
   sameSite: "Strict"|"Lax"|"None";
+
+  partitionKey?: string;
 }
 
 interface PageWaitForSelectorOptions {

diff --git a/packages/playwright-core/src/protocol/validator.ts b/packages/playwright-core/src/protocol/validator.ts
@@ -136,6 +136,8 @@ scheme.SetNetworkCookie = tObject({
   httpOnly: tOptional(tBoolean),
   secure: tOptional(tBoolean),
   sameSite: tOptional(tEnum(['Strict', 'Lax', 'None'])),
+  partitionKey: tOptional(tString),
+  _crHasCrossSiteAncestor: tOptional(tBoolean),
 });
 scheme.NetworkCookie = tObject({
   name: tString,
@@ -146,6 +148,8 @@ scheme.NetworkCookie = tObject({
   httpOnly: tBoolean,
   secure: tBoolean,
   sameSite: tEnum(['Strict', 'Lax', 'None']),
+  partitionKey: tOptional(tString),
+  _crHasCrossSiteAncestor: tOptional(tBoolean),
 });
 scheme.NameValue = tObject({
   name: tString,

diff --git a/packages/playwright-core/src/server/chromium/crBrowser.ts b/packages/playwright-core/src/server/chromium/crBrowser.ts
@@ -381,19 +381,56 @@ export class CRBrowserContext extends BrowserContext {
   async doGetCookies(urls: string[]): Promise<channels.NetworkCookie[]> {
     const { cookies } = await this._browser._session.send('Storage.getCookies', { browserContextId: this._browserContextId });
     return network.filterCookies(cookies.map(c => {
-      const copy: any = { sameSite: 'Lax', ...c };
-      delete copy.size;
-      delete copy.priority;
-      delete copy.session;
-      delete copy.sameParty;
-      delete copy.sourceScheme;
-      delete copy.sourcePort;
-      return copy as channels.NetworkCookie;
+      const { name, value, domain, path, expires, httpOnly, secure, sameSite } = c;
+      const copy: channels.NetworkCookie = {
+        name,
+        value,
+        domain,
+        path,
+        expires,
+        httpOnly,
+        secure,
+        sameSite: sameSite ?? 'Lax',
+      };
+      // If hasCrossSiteAncestor is false, the cookie is a partitioned first party cookie,
+      // this is Chromium specific, see https://chromestatus.com/feature/5144832583663616
+      // and https://github.com/explainers-by-googlers/CHIPS-spec.
+      if (c.partitionKey) {
+        copy._crHasCrossSiteAncestor = c.partitionKey.hasCrossSiteAncestor;
+        copy.partitionKey = c.partitionKey.topLevelSite;
+      }
+      return copy;
     }), urls);
   }
 
   async addCookies(cookies: channels.SetNetworkCookie[]) {
-    await this._browser._session.send('Storage.setCookies', { cookies: network.rewriteCookies(cookies), browserContextId: this._browserContextId });
+    function toChromiumCookie(cookie: channels.SetNetworkCookie) {
+      const { name, value, url, domain, path, expires, httpOnly, secure, sameSite, partitionKey, _crHasCrossSiteAncestor } = cookie;
+      const copy: Protocol.Network.CookieParam = {
+        name,
+        value,
+        url,
+        domain,
+        path,
+        expires,
+        httpOnly,
+        secure,
+        sameSite
+      };
+      if (partitionKey) {
+        copy.partitionKey = {
+          topLevelSite: partitionKey,
+          // _crHasCrossSiteAncestor is non-standard, set it true by default if the cookie is partitioned.
+          hasCrossSiteAncestor: _crHasCrossSiteAncestor ?? true,
+        };
+      }
+      return copy;
+    }
+
+    await this._browser._session.send('Storage.setCookies', {
+      cookies: network.rewriteCookies(cookies).map(toChromiumCookie),
+      browserContextId: this._browserContextId
+    });
   }
 
   async doClearCookies() {

diff --git a/packages/playwright-core/src/server/firefox/ffBrowser.ts b/packages/playwright-core/src/server/firefox/ffBrowser.ts
@@ -297,18 +297,35 @@ export class FFBrowserContext extends BrowserContext {
   async doGetCookies(urls: string[]): Promise<channels.NetworkCookie[]> {
     const { cookies } = await this._browser.session.send('Browser.getCookies', { browserContextId: this._browserContextId });
     return network.filterCookies(cookies.map(c => {
-      const copy: any = { ... c };
-      delete copy.size;
-      delete copy.session;
-      return copy as channels.NetworkCookie;
+      const { name, value, domain, path, expires, httpOnly, secure, sameSite } = c;
+      return {
+        name,
+        value,
+        domain,
+        path,
+        expires,
+        httpOnly,
+        secure,
+        sameSite,
+      };
     }), urls);
   }
 
   async addCookies(cookies: channels.SetNetworkCookie[]) {
-    const cc = network.rewriteCookies(cookies).map(c => ({
-      ...c,
-      expires: c.expires === -1 ? undefined : c.expires,
-    }));
+    const cc = network.rewriteCookies(cookies).map(c => {
+      const { name, value, url, domain, path, expires, httpOnly, secure, sameSite } = c;
+      return {
+        name,
+        value,
+        url,
+        domain,
+        path,
+        expires: expires === -1 ? undefined : expires,
+        httpOnly,
+        secure,
+        sameSite
+      };
+    });
     await this._browser.session.send('Browser.setCookies', { browserContextId: this._browserContextId, cookies: cc });
   }
 

diff --git a/packages/playwright-core/src/server/webkit/wkBrowser.ts b/packages/playwright-core/src/server/webkit/wkBrowser.ts
@@ -255,19 +255,37 @@ export class WKBrowserContext extends BrowserContext {
   async doGetCookies(urls: string[]): Promise<channels.NetworkCookie[]> {
     const { cookies } = await this._browser._browserSession.send('Playwright.getAllCookies', { browserContextId: this._browserContextId });
     return network.filterCookies(cookies.map((c: channels.NetworkCookie) => {
-      const copy: any = { ... c };
-      copy.expires = c.expires === -1 ? -1 : c.expires / 1000;
-      delete copy.session;
-      return copy as channels.NetworkCookie;
+      const { name, value, domain, path, expires, httpOnly, secure, sameSite } = c;
+      const copy: channels.NetworkCookie = {
+        name,
+        value,
+        domain,
+        path,
+        expires: expires === -1 ? -1 : expires / 1000,
+        httpOnly,
+        secure,
+        sameSite,
+      };
+      return copy;
     }), urls);
   }
 
   async addCookies(cookies: channels.SetNetworkCookie[]) {
-    const cc = network.rewriteCookies(cookies).map(c => ({
-      ...c,
-      session: c.expires === -1 || c.expires === undefined,
-      expires: c.expires && c.expires !== -1 ? c.expires * 1000 : c.expires,
-    })) as Protocol.Playwright.SetCookieParam[];
+    const cc = network.rewriteCookies(cookies).map(c => {
+      const { name, value, domain, path, expires, httpOnly, secure, sameSite } = c;
+      const copy: Protocol.Playwright.SetCookieParam = {
+        name,
+        value,
+        domain: domain!,
+        path: path!,
+        expires: expires && expires !== -1 ? expires * 1000 : expires,
+        httpOnly,
+        secure,
+        sameSite,
+        session: expires === -1 || expires === undefined,
+      };
+      return copy;
+    });
     await this._browser._browserSession.send('Playwright.setCookies', { cookies: cc, browserContextId: this._browserContextId });
   }
 

diff --git a/packages/playwright-core/types/types.d.ts b/packages/playwright-core/types/types.d.ts
@@ -8830,6 +8830,13 @@ export interface BrowserContext {
      * Optional.
      */
     sameSite?: "Strict"|"Lax"|"None";
+
+    /**
+     * For partitioned third-party cookies (aka
+     * [CHIPS](https://developer.mozilla.org/en-US/docs/Web/Privacy/Guides/Privacy_sandbox/Partitioned_cookies)), the
+     * partition key. Optional.
+     */
+    partitionKey?: string;
   }>): Promise<void>;
 
   /**
@@ -9304,6 +9311,8 @@ export interface BrowserContext {
       secure: boolean;
 
       sameSite: "Strict"|"Lax"|"None";
+
+      partitionKey?: string;
     }>;
 
     origins: Array<{
@@ -22501,6 +22510,8 @@ export interface Cookie {
   secure: boolean;
 
   sameSite: "Strict"|"Lax"|"None";
+
+  partitionKey?: string;
 }
 
 interface PageWaitForSelectorOptions {

diff --git a/packages/protocol/src/channels.d.ts b/packages/protocol/src/channels.d.ts
@@ -260,6 +260,8 @@ export type SetNetworkCookie = {
   httpOnly?: boolean,
   secure?: boolean,
   sameSite?: 'Strict' | 'Lax' | 'None',
+  partitionKey?: string,
+  _crHasCrossSiteAncestor?: boolean,
 };
 
 export type NetworkCookie = {
@@ -271,6 +273,8 @@ export type NetworkCookie = {
   httpOnly: boolean,
   secure: boolean,
   sameSite: 'Strict' | 'Lax' | 'None',
+  partitionKey?: string,
+  _crHasCrossSiteAncestor?: boolean,
 };
 
 export type NameValue = {

diff --git a/packages/protocol/src/protocol.yml b/packages/protocol/src/protocol.yml
@@ -223,6 +223,8 @@ SetNetworkCookie:
       - Strict
       - Lax
       - None
+    partitionKey: string?
+    _crHasCrossSiteAncestor: boolean?
 
 
 NetworkCookie:
@@ -241,6 +243,8 @@ NetworkCookie:
       - Strict
       - Lax
       - None
+    partitionKey: string?
+    _crHasCrossSiteAncestor: boolean?
 
 
 NameValue: