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In Firefox there is a menu item that displays "Page Source": View | Page Source (Ctrl+U). In Internet Explorer there is a similar function.
When you invoke it, it displays a nicely formatted and syntax-highlighted collection of HTML (and JavaScript) code.
What I don't know is whether this HTML (viewable in the Page Source) is the result of pre-processing of the JavaScript (resulting in modification of the original raw HTML) or just raw as received by HTTP GET.
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The browser loads the html (DOM) at first. The browser starts to load the external resources from top to bottom, line by line. If a <script> is met, the loading will be blocked and wait until the JS file is loaded and executed and then continue.
The source code is passed through a program called a compiler, which translates it into bytecode that the machine understands and can execute. In contrast, JavaScript has no compilation step. Instead, an interpreter in the browser reads over the JavaScript code, interprets each line, and runs it.
The server side code is executed first and the output generated by server side is sent back to client where client side code is executed. Show activity on this post. Yes, normally, the whole server processing finished before the page is delivered to the browser. At this moment, JavaScript execution starts.
To execute JavaScript in a browser you have two options — either put it inside a script element anywhere inside an HTML document, or put it inside an external JavaScript file (with a . js extension) and then reference that file inside the HTML document using an empty script element with a src attribute.
The "View Source" code is the code before any JavaScript is applied.
Firefox's Web Dev toolbar will allow you to view the resulting post-JavaScript source code from the View Source > View Generated Source menu option.
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Before. The page source is the result of the GET request by the browser sans headers. If you want to view the updated content after scripts and so forth, you'll have to use a tool like Firebug or the Web Development toolbar.
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Unfortunately, it will always display the HTML as the page was before DOM-change by javascript, etc. So the answer is: what you are seeing is "raw as received by HTTP GET".
You can use a tool like Firebug (Firefox & Chrome) to see live dom changes. Or you can make your own function to display the live dom.
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It is the source that was returned to the browser by the server, before DOM updates made through javascript.
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