Choose a local file through a labeled control.
HTML: A file input exposes selected file metadata to the page without providing arbitrary filesystem access.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Example</title>
</head>
<body>
<label for="file">Text file</label><input id="file" type="file" accept=".txt,text/plain">
</body>
</html>Expected output EXAMPLE
Selecting a notes.txt file containing exactly "hello" exposes the filename notes.txt and a size of 5 bytes through the input's FileList. Selection does not upload the file.
Details
Save as example.html and open in a modern browser. The output describes browser behavior verified with DOM and interaction assertions. A file input exposes selected file metadata to the page without providing arbitrary filesystem access.
Accept is a picker hint, not content validation. This example selects a test file and does not upload it.
Tested on Ubuntu 24.04.5 LTS · · Chromium 141.0.7390.37 · libc6 2.39-0ubuntu8.9; Playwright 1.56.0
Test inputs, results and environment
The exact published code ran in a dedicated Linux test container with prepared inputs. Unprivileged snippet process, external networking disabled, read-only root filesystem, and a fresh temporary working directory. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.
- Architecture / host kernel
- x86_64 / 6.18.54.1-microsoft-standard-WSL2
- Snippet identity / locale
- uid=65534, gid=65534 (unprivileged) / C.UTF-8
- Interpreter invocation
Chromium: open example.html; execute the published browser assertions- Container image ID
sha256:32dc2d998158b6554c99b73b533f423696a0f3e31e8cbea9db10b5eee9a2fadd- Code SHA-256
e5e80b9a9738d1c0a440fe74f91843852599fe23b1912f47b66326250a5450ed- Dependencies
- libc6 2.39-0ubuntu8.9; Playwright 1.56.0
Test input setup
These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.
# No input files required.
Observed standard output
Expected output describes the rendered page. The standard-output record below is the browser test harness receipt; the additional assertions check the result and interactions.
Choose a local file through a labeled control: browser checks passed.
Exit code: 0. Standard error: empty. Validation: Shape/content assertions. System-dependent values above are one recorded run.
Additional assertions that passed
Checks recorded by the test harness. Where Python assertions are shown, browser cases use Playwright and simulator cases may inspect pin transitions: result.stdout is captured output, work is the temporary directory, and Path is pathlib.Path. The harness also imports json and csv.
await page.locator('input').set_input_files({'name':'notes.txt','mimeType':'text/plain','buffer':b'hello'})
assert await page.locator('input').evaluate('(e)=>[e.files[0].name,e.files[0].size]')==['notes.txt',5]