What is the difference between HTML and React event handling

The main difference between HTML and react events are:

In HTML, the event name usually represents in lowercase as a convention:

<button onclick='activateLasers()'>

Whereas in React it follows camelCase convention:

<button onClick={activateLasers}>

In HTML, you can return false to prevent default behavior:

<a href='#' onclick='console.log("The link was clicked."); return false;' />

Whereas in React you must call preventDefault() explicitly:

function handleClick(event) {
  event.preventDefault()
  console.log('The link was clicked.')
}

In HTML, you need to invoke the function by appending () Whereas in react you should not append () with the function name. (refer "activateLasers" function in the first point for example)