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POUnderstanding HTTP Requests/Responses regarding the DOM and script execution
 

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    <p>I've been away from web design/development for a long, long now and have recently begun to get back into it. I started off doing things just to make them work, and now that I'm getting back into it, I would like to understand things a bit more clearly - including when the DOM is requested by the browser to when it is fully loaded, and the difference between script placement at the top and bottom of a page.</p> <p>I realise that this is more a post for <a href="http://doctype.com" rel="nofollow noreferrer">http://doctype.com</a>, but I figured I would get a more technical answer from here. I would also like to have made this a community wiki, but I don't have enough points...as yet.</p> <p>Please feel free to correct me here - My questions/assumptions:</p> <ol> <li>When the browser makes a request for the page, the server responds with a Document Object that contains the hierarchy/order of scripts, css and html - correct?</li> <li>Once received, the browser then builds a Document Object Tree - is this when the DOM is ready or when it starts rendering elements on the page in a browser?</li> <li>In that regard, what is the difference between "when the DOM is loaded" and "when the DOM is ready"?</li> <li>Is there any difference between placing (java)script at the top (in the head tag) or at the bottom (before <code>&lt;/body&gt;</code> tag)?</li> <li>Is there an DOM event that fires when all assets (css, images, javascripts, etc) are <strong>fully</strong> loaded by the browser? I ask this as sometimes I might have a background image still being loaded by the browser, and well before it can complete, my Javascript animations already start executing.</li> </ol> <p>Thank you for taking the time to read this, and i look forward to your responses!</p>
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