[Feature]: Permission Granting for Storage Access API

[BausPhi]

🚀 Feature Request

Web applications can utilise the Storage Access API to get unpartitioned access to third-party cookies across different websites. When the Storage Access API is used to request this unpartitioned access for the first time, browsers will show a permission dialog to the user in order to accept or deny the storage-access. To my knowledge, automating the permission grant and, as a result, resolving the permission dialog is currently not possible in Playwright (I could not find a permission value in the documentation to automatically grant this permission to sites). Therefore, I would suggest adding a permissions value that can be used to automate granting the storage-access permission to websites.

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Sources Storage Access API:

• Official W3C Work Item
• developers.google.com

Example

The feature can be used to grant the storage-access permission to websites without manually resolving the permission dialog in the browser. The following code is an example how the feature could look like to automatically grant the permission to websites:

const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch();
  
  // Granting the storage-access permission to the context
  const context = await browser.newContext({
    permissions: ["storage-access"]
  });

  await context.close();
  await browser.close();
})();

Motivation

During automated testing, encountering permission dialogs disrupt the test flow and require manual interaction, which defeats the purpose of automation. By enabling automatic storage-access permission granting and resolving the permission dialog, Playwright can provide a more seamless and efficient testing experience for websites using the Storage Access API.

Additionally, with all major browsers transitioning to storage partitioning, the Storage Access API has become the sole method for utilising third-party cookies across different websites. Without the ability to automatically grant this permission, it is impossible to perform the automated testing of websites using third-party cookies in a real-world scenario where the user would grant the storage-access permission to the website.