UAssert — Multi-Domain Testing Sandbox

🧪 Open-Source Testing Playground

Master Test Automation
Across Every Domain

Practice with 15 specialized domains, 100+ interactive elements, and real-world scenarios — all in a single page. Every element is tagged with data-testid for stable selectors.

Domains

200+

Elements

Industry Apps

Platform Tools

Works with every automation framework

Selenium Cypress Playwright Puppeteer WebDriverIO TestCafe

🎯 Core Testing

Forms & Inputs

Text, email, password with strength, checkboxes, radio buttons, selects, toggles, range sliders, date/time/color pickers, validation.

Validation Dropdowns Toggles Datepicker

18 Elements

Data Tables

Sortable, filterable, paginated data tables. Inline editing, select-all, add/delete rows, calculated totals.

Sort Filter Pagination Inline Edit

8 Elements

User Interactions

Drag & drop, sortable lists, click events (single, double, right, long-press), star ratings, keyboard events, file uploads.

Drag & Drop Keyboard File Upload

12 Elements

Dynamic Content

Progress bars, skeletons, spinners, alerts, modals, toasts, timers, countdown, infinite scroll, dynamic element creation.

Loading Modals Timers Infinite Scroll

10 Elements

🧩 UI Components & Navigation

Navigation

Tabs, accordions, breadcrumbs, multi-step stepper, carousel/slider with dot navigation.

Tabs Accordion Stepper Carousel

8 Elements

Media & Graphics

Images with lazy loading, broken image handling, HTML5 video/audio, SVG graphics, resizable elements.

Video SVG Lazy Load

6 Elements

Canvas & Charts

Drawing canvas with brush tools, undo, download. Bar, line, and pie chart rendering.

Drawing Charts Export

4 Elements

🔗 Integration & Advanced

API Mock

REST API simulator with GET/POST/PUT/DELETE. Mock endpoints, error handling, slow responses, request history.

REST Mock Error Handling

6 Elements

Advanced

Shadow DOM, iFrame interactions, window ops, context menus, code blocks, DOM Mutation Observer.

Shadow DOM iFrame Context Menu

10 Elements

Performance

DOM metrics, large list rendering, network throttle simulator, debounce & throttle testing.

Metrics Throttle Benchmark

6 Elements

🔐 Authentication

Authentication

6 Elements

♿ Accessibility & Storage

Accessibility (A11y)

ARIA attributes, keyboard navigation, color contrast testing, skip links, live regions, fieldsets.

ARIA Keyboard Contrast

8 Elements

Browser Storage

LocalStorage, SessionStorage, and Cookie CRUD operations. View all keys, clear storage.

LocalStorage Cookies CRUD

5 Elements

Clipboard & Tags

Copy/paste operations, clipboard API access, tag/chip manager with add/remove.

Copy Paste Tags

4 Elements

Notification Center

Bell badge, dropdown panel, filter by type, mark read/unread, delete, preferences, auto-generated from domain actions.

Bell Badge Filters Preferences Live Events

16 Elements

Analytics

Geolocation capture, page impressions, visitor count, domain heatmap, session timeline, browser fingerprint.

Geolocation Impressions Heatmap Fingerprint

18 Elements

🏢 Industry Applications

Banking & Finance

Account dashboard, transactions, transfers, bill pay, loan calculator, statements.

Accounts Transfers Loans

12 Elements

Retail & POS

POS terminal, product catalog, barcode scanner simulation, receipt generation, inventory management.

POS Inventory Receipts

10 Elements

Healthcare & Medical

Patient records, appointments, prescriptions, vitals tracking, medical history, insurance info.

Patients Vitals Prescriptions

14 Elements

Insurance

Policy management, claims filing, quote calculator, coverage options, document upload.

Policies Claims Quotes

10 Elements

Travel & Hospitality

Flight & hotel search, booking flow, itinerary, check-in, loyalty points, reservations.

Flights Hotels Booking

12 Elements

Education & LMS

Course catalog, enrollment, gradebook, assignments, quizzes, progress tracking, certificates.

Courses Quizzes Grades

12 Elements

Real Estate

Property listings, search filters, mortgage calculator, schedule viewing, favorites, comparisons.

Listings Mortgage Viewings

10 Elements

E-Commerce

Product cards, shopping cart with add/remove, quantity, price calculations, coupon codes, checkout flow.

Cart Checkout Coupons

8 Elements

🛠️ Platform Tools

Platform Tools

data-testid viewer, reset/flush data, JavaScript API, sample data generators, import/export, activity logging.

TestID API Generators Logging

6 Features

Quick Start

Every element uses data-testid for stable selectors.

// Playwright example
await page.click('[data-testid="text-input"]');
await page.fill('[data-testid="text-input"]', 'Hello');

Documentation

Each domain has detailed step-by-step guides with code examples and testable elements list.

Input Fields

Text Input

Email Input

Password Input

Password strength

Number Input

Phone Input

Search Input

Disabled Input

Read-Only Input

Selects & Dropdowns

Single Select

Multi Select (hold Ctrl/Cmd)

Grouped Select

Custom Dropdown

Select priority...

Datalist (Autocomplete)

Range, Date, Color & Textarea

Range Slider 50

Date Input

Date & Time Input

Time Input

Color Picker

#6366f1

Textarea 0/500

Contenteditable Div

Click to edit this rich text area...

Form Validation

First Name *

Last Name *

Email *

Age (18-120) *

Website URL

Confirm Password *

I agree to the Terms & Conditions

Sortable & Filterable Data Table

	ID	Name	Email	Role	Status	Actions

Showing 1-5 of 20

Inline Editable Table

Product	Price	Quantity	Total
Widget A	$29.99	3	$89.97
Gadget B	$49.99	2	$99.98
Component C	$15.50	10	$155.00

Drag & Drop

Available Items

📦 Item 1

📦 Item 2

📦 Item 3

📦 Item 4

Drop Zone

Drop items here

Dropped: 0 items

Sortable List

1. Learn Selenium

2. Write Test Cases

3. Run Automation Suite

4. Review Results

5. Report Bugs

Click Events & Buttons

Click event result will appear here...

Click Counter

Hover, Focus & Tooltips

Star Rating

★ ★ ★ ★ ★

Rating: 0/5

Focus Tracking

State: idle

File Upload

Drag & drop files here or click to browse

Keyboard Events

Key: -

Code: -

Which: -

Type: -

Shift: false

Ctrl: false

Alt: false

Meta: false

Try shortcuts: Ctrl+S Ctrl+Z Escape

Dynamic Loading & Waiting

Alerts, Dialogs & Toasts

Dialog result appears here...

Timers & Countdown

00:00:00

Countdown Timer

seconds

Infinite Scroll

Items loaded: 0

Dynamic Element Creation

Dynamic elements will appear here...

Elements: 0

Auto-Refresh Data

Updates every 2 seconds

CPU Usage

45%

Memory

62%

Requests/s

1,234

Errors

Last updated: -

Tabs

Overview

This is the overview tab. It provides a general summary of the content.

Details

Detailed information about the selected item including specifications and metadata.

Settings

Enable feature X Enable feature Y

History

Version 3.0 released

2 hours ago

Bug fix deployed

5 hours ago

Performance optimization

1 day ago

Accordion

What is Test Automation?

Test automation is the practice of using software tools to execute pre-scripted tests on a software application before it is released into production.

Why use a Sandbox?

A sandbox provides a safe environment to practice automation without affecting real systems. It includes various UI elements and scenarios commonly found in production applications.

Supported Frameworks

This sandbox works with Selenium, Cypress, Playwright, Puppeteer, WebDriverIO, TestCafe, and any other browser automation tool.

Best Practices

Use data-testid attributes for stable selectors, implement page object models, and avoid brittle XPath/CSS selectors that depend on DOM structure.

Breadcrumbs & Stepper

Breadcrumbs

Multi-Step Progress

✓

AccountProfileSettingsReviewComplete

Carousel / Slider

Slide 1: Code Quality

Write clean and maintainable test code.

Slide 2: Fast Execution

Optimize test runs for speed.

Slide 3: Reliability

Build stable and reliable test suites.

Images & Lazy Loading

Image with alt text

Lazy loaded image

⚠️ Broken image (for error handling tests)

Video & Audio

HTML5 Video Player

Audio Player

Responsive & Resizable

Resizable Box

Drag the bottom-right corner to resize. Current size: -

SVG & Inline Graphics

API Request Simulator

Request Body (for POST/PUT)

Response

// Response will appear here...

Mock API Endpoints

GET /api/users

POST /api/users

PUT /api/users/1

DELETE /api/users/1

GET /api/error

GET /api/slow

Request History

No requests made yet. Try an API call above!

Shadow DOM

Shadow DOM host element

The element above contains a Shadow DOM with encapsulated styles and elements.

iFrame

Window Operations

Window Size: -

Scroll Position: 0

User Agent:

Context Menu Zone

Right-click here for custom context menu

Context action: none

Code Blocks

// Selenium WebDriver example
const driver = new Builder()
  .forBrowser('chrome')
  .build();

await driver.get('http://localhost');
const el = await driver.findElement(
  By.css('[data-testid="text-input"]')
);
await el.sendKeys('Hello World');
await driver.quit();

// Playwright example
const { test, expect } = require('@playwright/test');

test('form submission', async ({ page }) => {
  await page.goto('http://localhost');
  await page.fill('[data-testid="text-input"]', 'Test');
  await page.click('[data-testid="submit-form"]');
  await expect(page.locator('[data-testid="form-result"]'))
    .toBeVisible();
});

DOM Mutation Observer

Watching for DOM changes...

Mutation Log:

Pro Laptop 15"

In Stock

High-performance laptop with 16GB RAM, 512GB SSD.

$1,299

Wireless Headphones

In Stock

Premium noise-cancelling headphones with 30hr battery.

$349

Mechanical Keyboard

Low Stock

RGB mechanical keyboard with Cherry MX switches.

$189

Shopping Cart 0

Your cart is empty

Subtotal: $0.00

Tax (10%): $0.00

Total: $0.00

Login Form

Hint: Username: admin, Password: admin123

Registration Form

First Name

Last Name

Password

Confirm Password

I agree to the Terms of Service

Auth State Dashboard

Not logged in

Please login to access the dashboard

Unauthorized

ARIA Attributes

This is a live region (aria-live="polite")

Progress: 75% (role="progressbar")

Status: Ready

Keyboard Navigation

Use Tab to navigate, Enter/Space to activate:

Fieldset with Legend Option One Option Two

Visual Accessibility Tests

High Contrast

Ratio: 7.5:1

Low Contrast

Ratio: 1.5:1 ⚠️

Light Theme

Ratio: 12:1

Medium Contrast

Ratio: 4.5:1

Skip Link (hidden until focused)

Tab to this area to reveal the skip link

Drawing Canvas

Canvas Charts

Performance Metrics

DOM Load Time

Page Load Time

DOM Elements

Memory (JS Heap)

Large List Rendering

Render time: -

Network Throttle Simulator

Select a speed and click simulate...

Debounce & Throttle Test

Debounced Input (300ms)

Calls: 0 | Value: -

Throttled Button (1s)

Actual clicks: 0 | Throttled: 0

LocalStorage

Storage result appears here...

SessionStorage & Cookies

SessionStorage

Clipboard Operations

Text to Copy

Paste Area

Tag/Chip Manager

Selenium × Cypress × Playwright ×

Tags: 3

Seed Data & Flush / Reset Center

Populate domains with sample data or reset to clean defaults — per-category or globally.

Forms & Tables

Inputs, selects, checkboxes, table rows, editable cells.

Interactive Elements

Drag-drop zones, dynamic elements, tags, star rating, counter.

Banking & Finance

Account balances, transactions, transfer history.

Retail & POS

POS line items, barcode scans, inventory data.

Healthcare & Medical

Patient vitals, appointments, medications.

E-Commerce & Cart

Shopping cart items, coupon, checkout state.

Auth & Sessions

Platform & Storage

LocalStorage, SessionStorage, Cookies, Activity log.

data-testid Attributes

Highlight and inspect all data-testid elements on the page.

Total: 0 elements

JavaScript API

Access window.TestSandbox from console or test scripts.

// Seed & Flush
TestSandbox.seed('banking')  // seed one category
TestSandbox.flush('ecommerce')
TestSandbox.seedAll()
TestSandbox.flushAll()
// Navigation & Data
TestSandbox.navigate('healthcare')
TestSandbox.generateData('user')
TestSandbox.exportState()
TestSandbox.getActivityLog()

Sample Data Generators

Click a button to generate data...

Import / Export State

Reproducible test fixtures

Capture full application state — cart, auth, storage, activity log, POS items — as a single JSON file.

Cart Auth Storage Activity Log POS

Load a previously exported JSON file to restore the exact application state.

Drop a JSON file here or click to browse

Paste exported JSON directly and apply it.

Snapshots

Save, name & restore domain states

No snapshots saved yet.
Enter a name above and click Save Snapshot.

Activity Logging — Audit Trail

Filter:

Total

Info

Action

Warn

Error

Seed

--:--:--INFOINITActivity logging ready

Account Overview

Total Balance

$24,567.89

Primary

****4589

Checking

$12,345.67

Savings

$12,222.22

Credit Card

-$1,432.50

Transaction History

Income

+$0.00

Expenses

-$0.00

Count

From Account

To Account

Amount ($)

Memo

Payee

Amount ($)

Schedule Date

Make this a recurring payment

Deposit To

Amount ($)

Source

Reference / Check #

Loan Calculator

Loan Amount$50,000

Interest Rate5.5%

Term (Years)15

Monthly

$408.54

Total Interest

$23,537

Total Paid

$73,537

Scheduled & Recurring Payments

No scheduled payments yet. Use Bill Pay to schedule one.

POS Terminal

Amount Due

$0.00

Current Sale

No items scanned

Subtotal:$0.00

Tax (8%):$0.00

Total:$0.00

Barcode Scanner

Simulate barcode scanning by clicking products or entering codes.

Inventory Lookup

Widget A

SKU: SKU001

150 in stock

$9.99

Gadget B

SKU: SKU002

23 in stock

$19.99

Tool C

SKU: SKU003

5 in stock

$29.99

Patient Information

John Doe

MRN: 1234567890

DOB: 1985-03-15 Blood: O+ ⚠️ Penicillin Allergy

Current Vitals

Heart Rate (bpm)

120/80

Blood Pressure

98.6°F

Temperature

98%

SpO2

Resp Rate

165

Weight (lbs)

Appointments

Annual Physical

Dr. Smith • Room 204

Today

10:30 AM

Lab Work

Lab • Floor 1

Mar 15

8:00 AM

Current Medications

Lisinopril 10mg

Once daily • Blood Pressure

Active

Metformin 500mg

Twice daily • Diabetes

Refill Soon

My Policies

Auto Insurance

Policy #AUT-2024-78945

Active

Premium

$125/mo

Deductible

$500

Renewal

Jun 15, 2024

Home Insurance

Policy #HOM-2024-12356

Active

Premium

$89/mo

Coverage

$350,000

Renewal

Aug 01, 2024

File a Claim

Policy

Incident Date

Description

Estimated Amount

Get a Quote

Insurance Type

Coverage Level

Deductible

Estimated Monthly Premium

$125.00

Search Flights

From

Depart

Return

SFO

6:00 AM

5h 30m • Non-stop

JFK

2:30 PM

$299

Economy

SFO

10:15 AM

7h 45m • 1 stop (DEN)

JFK

9:00 PM

$189

Economy

Booking Summary

Select a flight to continue

Passengers

Class

Loyalty Program

Gold Member

45,230 pts

4,770 pts to Platinum status

Course Catalog

Test Automation Fundamentals

12 lessons • 6 hours

Enrolled

65% Complete

Selenium WebDriver Masterclass

24 lessons • 15 hours

$49.99

Playwright End-to-End Testing

18 lessons • 10 hours

$39.99

Current Lesson

Lesson 7: Writing Effective Locators

Learn how to create maintainable and stable element locators using CSS selectors and XPath.

7 of 12

Quick Quiz

Which locator strategy is most reliable?

XPath with absolute path data-testid attribute CSS class selector Element index

My Progress

85%

Quiz Avg

Completed

In Progress

Certificates Earned

Property Search

Location

Property Type

Price Range

Bedrooms

$425,000

123 Oak Street

San Francisco, CA 94102

3 bed 2 bath 1,450 sqft

$325,000

456 Pine Avenue #12B

Oakland, CA 94612

2 bed 1 bath 980 sqft

$875,000

789 Lakeview Dr

Palo Alto, CA 94301

4 bed 3 bath 2,800 sqft

Mortgage Calculator

Home Price

Down Payment (%)

Interest Rate (%)

Loan Term

Estimated Monthly Payment

$2,149

Schedule Viewing

Select Property

Preferred Date

Preferred Time

Notification Center

All notifications from across the sandbox — 0 total, 0 unread

Total

Info

Success

Warning

Alert

No notifications yet.
Use the app or click Generate Sample to create some.

Notification Preferences

Banking Alerts

Transfers, deposits, withdrawals

E-Commerce

Cart, checkout, coupons

Healthcare

Appointments, refills, vitals

Travel

Bookings, loyalty, flights

System

Seed, flush, import, export

Auth

Page Impressions

This session

Total Visits

All time

Domains Visited

This session

Session Duration

Started just now

User Actions

Clicks & inputs

Geolocation

Location data requires your permission.

Visitor Fingerprint

Domain Visit Frequency

Navigate to different domains to see visit counts here.

Session Timeline

Timeline will populate as you navigate.

Page Impressions History

Total all-time visits: 0 First visit: — Sessions: 1

Modal Dialog

Are you sure?

📚 Documentation & Guides

Master Test Automation Across Every Domain

Forms & Inputs

Data Tables

User Interactions

Dynamic Content

Navigation

Media & Graphics

Canvas & Charts

API Mock

Advanced

Performance

Authentication

Accessibility (A11y)

Browser Storage

Clipboard & Tags

Notification Center

Analytics

Banking & Finance

Retail & POS

Healthcare & Medical

Insurance

Travel & Hospitality

Education & LMS

Real Estate

E-Commerce

Platform Tools

No domains found

Quick Start

Documentation

Input Fields

Selects & Dropdowns

Checkboxes & Radio Buttons

Range, Date, Color & Textarea

Form Validation

Sortable & Filterable Data Table

Inline Editable Table

Drag & Drop

Sortable List

Click Events & Buttons

Hover, Focus & Tooltips

File Upload

Keyboard Events

Dynamic Loading & Waiting

Data Loaded!

Alerts, Dialogs & Toasts

Timers & Countdown

Infinite Scroll

Dynamic Element Creation

Auto-Refresh Data

Tabs

Overview

Details

Settings

History

Accordion

Breadcrumbs & Stepper

Carousel / Slider

Slide 1: Code Quality

Slide 2: Fast Execution

Slide 3: Reliability

Images & Lazy Loading

Video & Audio

Responsive & Resizable

SVG & Inline Graphics

API Request Simulator

Mock API Endpoints

Request History

Shadow DOM

iFrame

Window Operations

Context Menu Zone

Code Blocks

DOM Mutation Observer

Pro Laptop 15"

Wireless Headphones

Mechanical Keyboard

Shopping Cart 0

Master Test Automation
Across Every Domain