Deep Dive Topics

Scoping Locators with filter() and has

Scoping Locators with filter() and has Repeating UI — table rows, product cards, notification items, list entries in a virtualized feed — produces locators that match ten elements...

Resolving Strict Mode Violations

Resolving Strict Mode Violations Error: strict mode violation: getByRole('button', { name: 'Save' }) resolved to 3 elements is the single most common failure a team hits after mov...

Why getByRole Beats CSS Selectors in Modern Apps

Why getByRole Beats CSS Selectors in Modern Apps Modern component frameworks generate DOM that no longer looks like the HTML a developer wrote. Bundlers hash class names, CSS-in-J...

Waiting for Network Idle vs Element State

Waiting for Network Idle vs Element State page.waitForLoadState('networkidle') reads like a universal readiness signal, which is exactly why it spreads through a suite: one test f...

Waiting Strategies for Dynamic React Components

Waiting Strategies for Dynamic React Components React rarely hands you a stable DOM. Fiber reconciliation detaches and re-attaches nodes during state transitions, Suspense swaps a...

Automating Elements Inside Nested Iframes

Automating Elements Inside Nested Iframes Checkout flows, embedded dashboards, CMS preview panes and vendor widgets all produce the same shape: an <iframe> inside an <iframe> , so...

Handling Cross-Origin Iframe Restrictions

Handling Cross-Origin Iframe Restrictions A checkout page embeds a payment widget from pay.vendor.test , a help page embeds a chat bubble from a support vendor, a dashboard embeds...

Testing Third-Party Payment Iframes

Testing Third-Party Payment Iframes Every card field on a modern checkout page belongs to somebody else. Stripe Elements, Adyen Secured Fields, Braintree Hosted Fields and Checkou...

Automating Shadow DOM Elements with Playwright

Automating Shadow DOM Elements with Playwright Selectors built on document.querySelector stop at the shadow boundary, so a CSS or XPath string that targets a node inside a web com...

Piercing Nested Shadow DOM Components

Piercing Nested Shadow DOM Components Web-component frameworks like Lit and Stencil compose UIs from custom elements that each hide their internals behind a shadow root, and those...