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copied!<ol> <li>Browsers make conditional and unconditional requests to the server. (The Server Responds to Inquiry and the Client Renders responses...there is a limited throughput of information to and from the user <em>(Privacy Settings & Etc.)</em></li> </ol> <p><strong>Unconditional Requests:</strong></p> <blockquote> <p>An unconditional request is made when the client browser does not have a cached copy of the resource available locally. In this case, the server is expected to return the resource with a HTTP/200 OK response. If the response’s headers permit it, the client may cache this response in order to reuse it later. If the browser later needs a resource which is in the local cache, that resource’s headers are checked to determine if the cached copy is still fresh. If the cached copy is fresh, then no network request is made and the client simply reuses the resource from the cache.</p> </blockquote> <p><strong>Conditional Requests:</strong></p> <blockquote> <p>If the browser later needs a resource which is in the cache, but that response is expired (older than its max-age or past the Expires date), then the client will make a conditional request to the server to determine whether the previously cached response is still valid and should be reused. The conditional request contains an If-Modified-Since and/or If-None-Match header that indicates to the server what version of the content the browser already has in its cache. The server can indicate that the client’s copy is still fresh by returning HTTP/304 Not Modified headers with no body, or it can indicate that the client’s copy is stale by returning a HTTP/200 OK response with the new version of the resource.</p> </blockquote> <ol start="2"> <li><p>The Document Object Model - is a model of information as it pertains to a browsers request/response. In many ways ECMA/Javascript was born as a direct relation accessing page elements and became the default DOM Library solution for many of the browser objects (document.frm etc). However, implementation and support is non-unified and sparse across all browsers.</p></li> <li><p>Essentially, the DOM Being loaded is just a definition to say that the page is being rendered and the content has/is being invoked. This is something that cannot be counted on in regards to accessing DOM Object so, it is unfavorable method of interaction. Generally, you should use the ready status which means that the DOM is in a ready and waiting state of request.</p></li> <li><p>Yep loads of difference - execution order of the client side code means where it will be loaded. Load with the entire page object or load after all content.</p></li> <li><p>Yes and No. :) No Real Guarantee but, with javascript/jquery used you can use the onload event of the body to identify all elements of the page successfully loaded. This is a trick question btw. No real answer to my knowledge unless, I am mistaken to what you asked...</p></li> </ol>

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