Describe the bug

When using browser mode, the browser window pops up with a blank page regardless of the test status.

I guess it's because the iframe's src assignment was removed in this PR?

Reproduction

It's just a basic setup so I'm just pasting the files here:

{
  "name": "vitest-ui-bug",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "test": "vitest"
  },
  "devDependencies": {
    "vitest": "^1.3.1"
  }
}

import { test, expect } from 'vitest';

test('foo', () => {
  expect(window.innerWidth).toBeGreaterThan(0);
});

npx vitest --browser=chrome

The test passed normally.

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (12) x64 11th Gen Intel(R) Core(TM) i5-11400 @ 2.60GHz
    Memory: 3.48 GB / 15.80 GB
  Binaries:
    Node: 18.19.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - ~\scoop\apps\yarn\current\bin\yarn.CMD
    npm: 10.2.5 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Chromium (121.0.2277.128)
    Internet Explorer: 11.0.19041.3636
  npmPackages:
    vitest: ^1.3.1 => 1.3.1

Used Package Manager

npm

Validations

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• Read the Contributing Guidelines.
• Read the docs.
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• The provided reproduction is a minimal reproducible example of the bug.