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web workers

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Original file line number	Diff line number	Diff line change
`@@ -1005,3 +1005,20 @@ oldnode.parentNode.replaceChild(clone, oldNode);`
`1005`	`1005`	`* can reduce the number of event listeners by attaching one only to the parent`
`1006`	`1006`	`* event properties can be used to filter out the events we care about`
`1007`	`1007`	`* drawback: slightly more complex code but there are JS libraries to make this easy`
	`1008`	`+`
	`1009`	`+### web workers`
	`1010`	`+`
	`1011`	`+* javascript runs on a single thread in the browser`
	`1012`	`+* web workers: background thread support by the browser`
	`1013`	`+* only in modern browsers`
	`1014`	`+* you put worker code in a separate file`
	`1015`	+* worker can use ```postMessage``` to send messages to the caller
	`1016`	+* caller can subscribe to messages using ```Worker.onMessage```
	`1017`	`+`
	`1018`	+```js
	`1019`	`+var worker = new Worker('my_worker.js');`
	`1020`	`+worker.onMessage(function(event) {`
	`1021`	`+ console.log(event.data);`
	`1022`	`+});`
	`1023`	`+//my_worker.js: postMessage('hello there');`
	`1024`	+```

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