react.dev/docs/ref-06-dom-differences.md

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React has implemented a browser-independent events and DOM system for performance and cross-browser compatibility reasons. We took the opportunity to clean up a few rough edges in browser DOM implementations.

• All DOM properties and attributes (including event handlers) should be camelCased to be consistent with standard JavaScript style. We intentionally break with the spec here since the spec is inconsistent.
• The style attribute accepts a JavaScript object with camelCased properties rather than a CSS string. This is consistent with the DOM style JavaScript property, is more efficient, and prevents XSS security holes.
• All event objects conform to the W3C spec, and all events (including submit) bubble correctly per the W3C spec. See Event System for more details.
• The onChange event behaves as you would expect it to: whenever a form field is changed this event is fired rather than inconsistently on blur. We intentionally break from existing browser behavior because onChange is a misnomer for its behavior and React relies on this event to react to user input in real time. See Forms for more details.