WebdriverIO uses WebDriver’s element-location capabilities through its own element-query commands: $() finds one matching element, and $$() finds multiple matches. In WebdriverIO, these are called selectors. CSS is the default query form; XPath and other documented selector forms are available when you specify them. “Selenium locator” is useful shorthand for the underlying WebDriver concept, but not every WebdriverIO selector syntax is a separate protocol-level locator strategy.
How WebdriverIO uses Selenium locators
The WebDriver protocol provides commands to find one element or a collection of elements. WebdriverIO exposes these through its element-query APIs, with $() and $$() as the convenient methods for normal use. The names are WebdriverIO APIs, not jQuery or Sizzle functions. See the WebDriver Protocol API reference and the WebdriverIO selector guide.
In practice, a selector is the expression you pass to a query command. Some expressions map to familiar WebDriver strategies, such as CSS or XPath; others are WebdriverIO-supported forms with framework-specific behavior. Avoid assuming every form is an independent, universally supported WebDriver protocol strategy.
Find one or several elements
Use $() when your next action or assertion concerns one match, and $$() when you need a collection. For example:
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const submitButton = await $('[data-testid="submit"]');
await submitButton.click();
const links = await $$('a');
console.log(`Found ${links.length} links`);The examples show the query shape; they assume they run inside a configured WebdriverIO test or command context. WebdriverIO documents repeated DOM queries as something to limit where practical, so retain and reuse an element reference when that suits the test rather than repeatedly querying for the same target. See WebdriverIO Best Practices.
Choose a selector that fits the element
| Need | Example | What to know |
|---|---|---|
| Default browser query | $('.checkout button') |
CSS is the default when no other strategy is indicated. |
| Element with an HTML ID | $('#someid') |
Use a CSS ID selector, or XPath such as $('//*[@id="someid"]'). The general WebDriver protocol does not define id as a locator strategy. |
| Exact user-facing text | $('button=Submit') |
WebdriverIO supports exact-text selector syntax. It can express what a user sees, but translations or copy changes can require updating the test. |
| Partial link text | $('*=driver') |
WebdriverIO documents this form for partial link-text matching. |
| Accessible name | $('aria/Submit') |
Queries by accessible name. The implementation depends on session type, as described below. |
| XPath | $('//button[@type="submit"]') |
Use an explicit XPath expression when its document relationship or matching logic is useful. |
| Driver-specific ID strategy | $('id=someid') |
Do not rely on this as a general browser WebDriver strategy. Some drivers, including certain Appium drivers, may support it. |
For the ID examples, replace someid with the element’s actual HTML id value. The selector syntax and session details are documented in the WebdriverIO selector guide.
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Prefer resilient, meaningful selectors
A selector that describes an element’s purpose is usually easier to maintain than one that depends on incidental markup or styling. The WebdriverIO guide identifies a generic tag query such as $('button') and a style-coupled class query such as $('.btn.btn-large') as poor choices in its examples, while showing $('[data-testid="submit"]') and $('aria/Submit') as better alternatives.
- Use a test attribute when the application team can provide a stable, purposeful attribute such as
data-testid. - Use accessible names or exact visible text when the test should track the language a user or assistive technology encounters.
- Account for localization. Visible labels and accessible names may change with translated copy. Where applicable, WebdriverIO recommends using translation files rather than embedding a single language’s text in tests.
- Avoid styling hooks unless the style class itself is the behavior under test; redesigns can change classes without changing what the control does.
These are maintainability recommendations, not a promise that one locator is always fastest or infallible. Selector resilience depends on how the application is built and how the test is intended to behave.
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CSS or XPath: which should you use?
Use CSS for straightforward attributes, IDs, classes, and relationships it can express clearly. Use XPath when you need XPath’s document-navigation or matching capabilities. Both are documented WebDriver query strategies, but readability and resilience should drive the choice more than a blanket speed claim. A query tied to a transient class can break regardless of whether it is written in CSS or XPath.
For example, a stable test attribute is generally clearer than selecting a submit button by a long chain of layout classes. If the test’s purpose is to verify the user-visible submit action, an accessible name or exact text can communicate that intent more directly—provided the test handles language changes appropriately.
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Session and platform behavior that can change the result
Accessible-name selectors and BiDi
According to the current WebdriverIO selector guide, a WebDriver BiDi session uses an accessibility locator against the browser’s accessibility tree for aria/ queries. In a Classic session, WebdriverIO uses a heuristic XPath fallback. The same selector spelling therefore should not be treated as evidence that every session uses the same underlying query mechanism.
Shadow DOM in WebdriverIO v9
The guide states that WebdriverIO v9 automatically pierces shadow DOM. The older >>> deep-selector workaround is unnecessary in v9. This is version-specific behavior; check the guide for the version used by your project rather than carrying older selector recipes forward uncritically.
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Mobile and Appium selectors
Mobile selector forms can rely on Appium or a compatible driver, and support may depend on whether the target is iOS or Android and on the selected driver. Treat those forms as platform- and driver-specific, not as universal browser WebDriver strategies. Confirm support in the WebdriverIO selector guide and the documentation for your actual driver.
Common locator problems and fixes
- An ID selector returns no match: confirm the element is present in the current page and that the CSS selector uses the real HTML ID, for example
$('#someid'). Do not assumeid=someidis supported by every browser driver. - An exact-text selector stops matching: check for changed wording, punctuation, or locale. If translated text is intentional, source expected strings from the applicable translation files or use a stable test attribute when visible copy is not what the test needs to verify.
- A class-based selector breaks after a redesign: replace styling-dependent classes with a purposeful test attribute or an appropriate semantic selector.
- An
aria/result differs between sessions: check whether the session uses WebDriver BiDi or Classic; WebdriverIO documents different mechanisms for those cases. - A shadow-DOM query uses an old workaround: if the project uses WebdriverIO v9, remove the obsolete
>>>workaround and follow the current guide. - A mobile selector works on one device but not another: verify the platform and driver’s support for that selector form; mobile strategies are not all portable.
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