# `react-doctor/mouse-events-have-key-events`

Pair mouse events with their keyboard equivalents.

- **Status:** Active
- **Category:** Accessibility
- **Assessment:** Evidence-required risk
- **Required evidence:** source code, rendered UI, accessibility audit
- **Default configuration:** Enabled
- **Default severity:** warn
- **Scope:** All supported frameworks
- **Active when:** always
- **Requirements:** react
- **Tags:** react-jsx-only
- **Priority:** 38 (P3)
- **Source:** oxlint-plugin-react-doctor
- **Rule set:** oxlint-plugin-react-doctor 0.9.3 (prompt schema 2)
- **Documentation:** [Official documentation](https://oxc.rs/docs/guide/usage/linter/rules/jsx_a11y/mouse-events-have-key-events)

## Validation prompt

Confirm the detector match and collect the required evidence before deciding whether an edit is warranted.

Fires on an intrinsic HTML element (not custom components like <MyElement>) when a hover-in handler with a bound value (default onMouseOver) lacks a matching onFocus, or a hover-out handler (default onMouseOut) lacks a matching onBlur: onFocus={undefined} or onBlur={undefined} also fires, while a bare valueless attribute is skipped. The watched handlers are configurable via the hoverInHandlers/hoverOutHandlers settings.

Suppress when: a spread like <div onMouseOver={fn} {...props} /> can forward onFocus/onBlur at runtime, but the static check can't see inside props and still flags it.

## Evidence boundary

The diagnostic proves only that the detector's modeled source pattern matched. It does not prove runtime impact, product intent, rendered failure, or that one remediation is correct.

Establish the environment, explicit repository policy, relevant exceptions, and required rendered or runtime evidence before deciding the occurrence. This page’s Assessment and Required evidence fields define the review contract.

Default severity is registry metadata. Use the occurrence's JSON severity after repository configuration when ordering real findings.

Record one outcome:

- **Confirmed failure:** The required evidence establishes the violation.
- **Rejected:** A documented exception or false-positive predicate applies.
- **Needs evidence:** Named evidence can still be collected.
- **Unavailable:** Required evidence cannot be collected in this run.
- **Waived with evidence:** An authorized, scoped exception applies to an established failure.
- **Observation:** The review records an optional tradeoff without claiming a defect.

A waiver records its scope, authority, evidence, and review or expiry condition. It is not a pass or false positive.

## Fix prompt

Apply this candidate correction only after the required evidence confirms the risk.

Add the keyboard counterpart on the same element so keyboard and AT users get the same behavior: pair onMouseOver with onFocus and onMouseOut with onBlur, e.g. <div onMouseOver={show} onFocus={show} onMouseOut={hide} onBlur={hide} />. Reuse the same handler when the effect is identical, and remove any onFocus={undefined}/onBlur={undefined} that defeats the pairing. If the matching handler is genuinely injected via spread props, verify it at runtime before suppressing. See https://oxc.rs/docs/guide/usage/linter/rules/jsx_a11y/mouse-events-have-key-events

## Repository-wide copy prompt

Use this only for a repository-wide pass after validating each occurrence. For one occurrence, use the occurrence-level guidance above.

````text
Fix every confirmed `react-doctor/mouse-events-have-key-events` diagnostic in the current repository.

Required change:
- Add the keyboard counterpart on the same element so keyboard and AT users get the same behavior: pair onMouseOver with onFocus and onMouseOut with onBlur, e.g. <div onMouseOver={show} onFocus={show} onMouseOut={hide} onBlur={hide} />. Reuse the same handler when the effect is identical, and remove any onFocus={undefined}/onBlur={undefined} that defeats the pairing. If the matching handler is genuinely injected via spread props, verify it at runtime before suppressing. See https://oxc.rs/docs/guide/usage/linter/rules/jsx_a11y/mouse-events-have-key-events.

Validation before editing:
Fires on an intrinsic HTML element (not custom components like <MyElement>) when a hover-in handler with a bound value (default onMouseOver) lacks a matching onFocus, or a hover-out handler (default onMouseOut) lacks a matching onBlur: onFocus={undefined} or onBlur={undefined} also fires, while a bare valueless attribute is skipped. The watched handlers are configurable via the hoverInHandlers/hoverOutHandlers settings.

Suppress when: a spread like <div onMouseOver={fn} {...props} /> can forward onFocus/onBlur at runtime, but the static check can't see inside props and still flags it.

Constraints:
- Make the smallest change that fixes the root cause.
- Preserve behavior and interfaces unrelated to this diagnostic.
- Reuse existing project components, utilities, and conventions.
- Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations.
- Preserve accessible names, focus order, keyboard behavior, and touch access not targeted by this rule.
- Adapt identifiers and framework details instead of copying blindly.
- Do not disable the rule or suppress matching code.

Assessment:
- Record detector evidence, applicability facts, assumptions, missing evidence, and the rule class for this occurrence.
- Return one outcome: Confirmed failure, Rejected, Needs evidence, Unavailable, Waived with evidence, or Observation.
- A waiver records the established failure, scope, authority, evidence, and review or expiry condition. It is not a pass or false positive.

Verification:
- Run focused tests for the changed behavior.
- Run React Doctor and confirm this diagnostic no longer appears from changed code.
- Run an unfiltered scan of the affected scope before claiming no cross-category regression.
- Report the files changed and any checks you could not run.
````