Iframe loading and processing

Having following code

Code:

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<iframe id="myframe" src="..."></iframe>

<script>
    document.getElementById('myframe').onload = function() {
      alert('myframe is loaded');
    };
</script>

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i wonder how does the browser processes an iframes? Does it load the iframe content in the separate thread? If so is it run synchronously with the main thread?

If it is getting run in a separate thread, why would it be executed synchronously with the main thread (i.e. why create a separate thread to run a synchronous task)?

Quote:

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Originally Posted by Arjay

If it is getting run in a separate thread, why would it be executed synchronously with the main thread (i.e. why create a separate thread to run a synchronous task)?

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So the answer is that it's run in the one main thread?

Quote:

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Originally Posted by Mulligan

So the answer is that it's run in the one main thread?

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I don't know whether iFrames are run in separate threads (I suspect they may be); however, if they are run in separate threads, it would be doubtful that they would be synchronized with the main thread (because that would defeat the purpose of using a separate thread).

Older browsers definitely use 1 thread. Most current browsers use 1 process. Chrome does additional tabs & iframes out of process.