[Bug]: Page.waitForURL('about:blank') fails if `baseURL` configured

[danielwiehl]

Version

1.52.0

Steps to reproduce

1. Clone my repo at https://github.com/danielwiehl/playwright-bug-reproducer-about-blank
2. npm install
3. npm run test
4. See the test failure due to timeout in reproducer.spec.ts › should wait for "about:blank" page

Expected behavior

The promise returned by page.waitForURL('about:blank') should resolve when navigating to the about:blank page.

Actual behavior

The promise of page.waitForURL('about:blank') does not resolve when navigating to the about:blank using page.goto('about:blank'), resulting in a timeout error.

This bug was introduced in version 1.52.0 and only occurs if having configured a baseURL in the Playwright config. Version 1.51.1 is working as expected.

Reproducer:

export default defineConfig({
  ...
  use: {
    baseURL: 'https://playwright.dev',
  }
});

test('should wait for "about:blank" page', async ({page}) => {
  await page.goto('about:blank');
  await page.waitForURL('about:blank'); // does not resolve if `baseURL` is set
});

Additional context

No response

Environment

System:
    OS: Windows 11 10.0.26100
    CPU: (20) x64 13th Gen Intel(R) Core(TM) i7-1370P
    Memory: 37.23 GB / 63.66 GB
  Binaries:
    Node: 22.16.0 - C:\dev\nodejs\node.EXE
    npm: 10.9.2 - C:\dev\nodejs\npm.CMD
    pnpm: 10.11.0 - C:\dev\nodejs\pnpm.CMD
  IDEs:
    VSCode: 1.99.3 - C:\dev\ide\Microsoft VS Code\bin\code.CMD
  Languages:
    Bash: 5.2.15 - C:\dev\programs\cmder\vendor\git-for-windows\usr\bin\bash.EXE
  npmPackages:
    @playwright/test: 1.52.0 => 1.52.0

[agg23]

Bisected to cd437c9 (which is the commit I suspected).

[danielwiehl]

Many thanks @agg23 for the quick fix, great!