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WebdriverIO uses element selectors through its $ and $$ query commands. CSS is the default; XPath and WebdriverIO-specific forms such as exact text and accessible-name selectors are also available. “Selenium locators” is a useful shorthand for WebDriver’s element-location strategies, but not every WebdriverIO selector form is a separate protocol-level strategy.
How WebdriverIO uses Selenium locators
WebdriverIO’s $ command queries for one element, while $$ queries for matching elements. They are its convenient element-query APIs, built around the element-finding capabilities of the WebDriver protocol. WebdriverIO’s official WebDriver Protocol reference documents the underlying find-element commands; its selector guide recommends $ and $$ for ordinary use.
The word “selector” covers both standard locator strategies, such as CSS and XPath, and WebdriverIO-level syntax that the framework interprets. Do not assume every selector prefix is itself a standard Selenium or WebDriver strategy.
Common WebdriverIO selector forms
| What you need | Example | What to know |
|---|---|---|
| CSS selector (default) | $('#someid') |
When no other strategy is indicated, WebdriverIO uses CSS. |
| XPath | $('//*[@id="someid"]') |
Use an XPath expression explicitly when it suits the element relationship or condition. |
| Exact visible text | $('button=Submit') |
WebdriverIO text syntax can target exact user-facing text. A copy or translation change can break it. |
| Partial link text | $('*=driver') |
This WebdriverIO form matches partial link text. |
| Accessible name | $('aria/Submit') |
Targets an accessible name; its behavior depends on session capabilities, as described below. |
| Test attribute | $('[data-testid="submit"]') |
A purposeful test hook can remain stable when visual styling changes. |
How to find an element by ID
For browser automation, select an element with an ID using CSS or XPath. A general id locator strategy is not provided by the WebDriver protocol, although some drivers, including certain Appium drivers, may support an ID form.
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- CSS:
$('#someid') - XPath:
$('//*[@id="someid"]') id=someid: use only when the selected driver explicitly supports that locator strategy.
Choosing a reliable selector
Prefer a selector that communicates the element’s purpose and is unlikely to change during an ordinary redesign. WebdriverIO’s selector guidance warns against generic tags and styling-coupled classes, and gives button and .btn.btn-large as poor choices in its example. A deliberate test attribute or an appropriate semantic selector is generally more maintainable.
- Use a test attribute such as
[data-testid="submit"]when the test needs a stable hook independent of styling. - Use an accessible name such as
aria/Submitwhen the accessible control name is meaningful to the test. - Use exact visible text such as
button=Submitwhen verifying the wording or targeting the same label a user sees. If the interface is translated, use the relevant translation files or another stable selector so localization does not make the test brittle. - Avoid broad or presentation-dependent matches unless they are genuinely what the test needs to validate.
There is no universally fastest selector established by the documented guidance. Choose based on intent, stability, session behavior, and driver support rather than assuming one form always wins.
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Session and platform differences that affect selectors
Accessible-name queries
In WebDriver BiDi sessions, WebdriverIO uses an accessibility locator against the browser’s accessibility tree for aria/ queries. In Classic sessions, it uses a heuristic XPath fallback. This distinction is documented in the current selector guide; the mechanism is not identical across session types.
Shadow DOM
WebdriverIO v9 automatically pierces shadow DOM. The older >>> deep-selector workaround is unnecessary in v9. If you maintain tests on another version, check that version’s selector documentation rather than assuming v9 behavior applies.
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Mobile automation
WebdriverIO documents mobile selector strategies, but some depend on Appium or a compatible driver and platform. Treat iOS- or Android-specific forms as driver-specific, not as general browser WebDriver locator strategies.
Keep element queries maintainable
WebdriverIO’s Best Practices guide recommends resilient selectors and limiting repeated element queries where possible. In practice, choose the selector that expresses the test’s intent, and avoid repeatedly querying the same DOM target without a reason. This improves clarity and can reduce unnecessary lookup work; it does not guarantee a particular runtime improvement.
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