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Find elements by what they mean to users when that meaning is clear: use a role and accessible name for controls, or a label for form fields. Prefer unique, predictable IDs when available; use a deliberate test ID when your team treats it as a testing contract or semantic locators cannot identify the target. Keep CSS and XPath selectors short and scoped, verify that each locator identifies exactly one intended element, and handle page readiness separately from locator choice.
What makes a locator reliable?
A useful locator does more than match the current page. It should identify the intended element uniquely, express the test’s intent clearly, and avoid depending on details likely to change during ordinary UI work. These are separate checks: a selector can be unique today but tied to fragile markup, or robustly chosen but match multiple elements.
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- Meaning: Does the locator describe a user-facing role, name, label, or behavior?
- Stability: Does it depend on generated classes, layout, or a long chain of DOM ancestors?
- Uniqueness: Does it identify exactly the intended element in the current page state?
- Ownership: If it uses a test-specific attribute, is someone responsible for maintaining that contract?
- Copy sensitivity: Would a wording or localization change appropriately affect the test?
- Framework support: Does your automation framework provide a suitable locator and waiting behavior?
Choose a locator in this order
1. Use role and accessible name for meaningful controls
For buttons, links, checkboxes, headings, and other controls with meaningful accessibility semantics, a role paired with an accessible name makes the test’s target clear in user-facing terms. For example, Playwright supports getByRole. Its documentation explains that role locators reflect how users and assistive technology perceive the page; that makes them a useful way to find controls, but it does not replace an accessibility audit or conformance testing. See Playwright’s locator documentation.
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Be specific enough to avoid matching another control with the same role. A role alone may match several buttons; pair it with the accessible name where appropriate. Names can change when product copy or localization changes, so consider whether that text is part of the behavior your test is meant to cover.
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2. Use a label for a form field
For a labeled input, a label-based locator communicates which field the test is using. Playwright provides getByLabel. Other documented Playwright helpers include getByText, getByPlaceholder, getByAltText, and getByTitle. Choose the helper that reflects the element’s actual user-facing identification rather than selecting whichever string happens to be nearby.
Visible text is useful when the text itself matters to the scenario, but it is sensitive to copy changes and can be ambiguous. Avoid relying on a partial substring without checking how many elements it matches.
3. Prefer a unique, predictable HTML ID when available
Selenium’s guidance says that unique, consistently predictable HTML IDs are generally the preferred method when available. An ID is not automatically stable: check that it is not generated anew on each render or release. See Selenium’s tips on working with locators.
4. Use a test ID as an intentional testing contract
Playwright provides getByTestId for test IDs such as data-testid. This is a reasonable choice when your team adopts test IDs as a convention, or when role or text cannot identify the target reliably. Treat the attribute as a contract between the application and test suite: agree on the convention and change the ID deliberately when the relevant interface contract changes. A test ID can be more stable than user-facing copy, but only if the team maintains it.
5. Use targeted CSS or XPath only when needed
CSS and XPath are available locator strategies, and they can be appropriate when semantic locators or stable identifiers are unavailable. Selenium lists CSS, name, link text, partial link text, class name, and tag name among its locator strategies; see Selenium’s locator strategies.
The risk is not CSS or XPath themselves; it is selectors that encode incidental implementation. Long chains tied to DOM ancestry or layout can stop working after a refactor. Playwright explicitly discourages long CSS and XPath chains for resilience. If structure is necessary, scope the selector to a stable region, make the target criterion understandable, and verify uniqueness. Avoid selecting “the third button” unless button order is itself what the test is checking.
Check uniqueness before relying on a locator
Ask whether the locator resolves to exactly the intended element in the page state where the test uses it. If multiple elements match, refine the locator with a meaningful name, label, or stable scope instead of accepting the first match or relying on position by default. If no element matches, first confirm that the page has reached the state in which the element should exist; do not immediately replace a sound locator with a more brittle one.
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A good locator does not guarantee that the application is ready for an action. The test may need to wait until the relevant page state exists—for example, until a control is rendered or enabled. Playwright describes locators as central to auto-waiting and retryability. Selenium likewise notes that an application may need to reach the state required for a command. See Playwright’s locator documentation and Selenium’s waiting strategies.
Prefer framework-supported waiting or retrying for the condition the test actually needs over an arbitrary sleep. Keep the locator responsible for identifying the element, and make the wait or assertion responsible for expressing the required state or user outcome. Locator choice and readiness are related to flakiness, but they solve different problems.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical review checklist
- State which user-visible element or behavior the test needs.
- Try a role and accessible name, or a label for a labeled form control, when those semantics identify the target.
- Use a unique, predictable ID if the application provides one; verify that it does not change unpredictably.
- Use a test ID if it is an agreed testing contract or semantic identification is insufficient.
- If CSS or XPath is necessary, keep it short, scoped, and independent of incidental DOM structure.
- Check that the locator matches one intended element in the relevant page state.
- Wait for the application condition needed before acting; do not use a sleep to mask an unclear readiness requirement.
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Example cURL request, using your API key and target URL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo documentation for request options. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots. Sign up for the free plan.
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