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Events guideline: Single entry for event and onXXX event handler #13595

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Events guideline: Single entry for event and onXXX event handler #13595

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Events guideline: Single entry for event and onXXX event handler
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6 changes: 5 additions & 1 deletion docs/data-guidelines.md
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Expand Up @@ -56,13 +56,17 @@ For example, the feature for a `focus` event targeting the `Element` interface w
}
```

This rule applies to the event features themselves, not the features for the event handlers. For example, `focus_event` and `onfocus` are two separate features.
The event handler `onfocus` is represented by the `focus_event` entry. Don't create features for `on` event handler properties. If an implementation doesn't support the event handler property, use `partial_implementation` with the note `"The <code>onfocus</code> event handler property is not supported."`. If only the `on` event handler property is supported and not the event name, use `"version_added": false`.

If a specification has two sections (the event handler property and the event name), add both specification links.

This practice emerged through several discussions:

- [#935](https://github.com/mdn/browser-compat-data/issues/935#issuecomment-464691417)
- [#3420](https://github.com/mdn/browser-compat-data/pull/3420)
- [#3469](https://github.com/mdn/browser-compat-data/pull/3469)
- [mdn/content#9098](https://github.com/mdn/content/discussions/9098)
- [#13595](https://github.com/mdn/browser-compat-data/pull/13595)

## Secure context required (`secure_context_required`)

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