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Thank you novice programmer
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I know we can do lot more these days with modern browsers today. debug javascript, write data to console e.tc. <br />
Do they keep track of how long it takes to load the page or how long it takes to upload/download a document from the server and such. <br />
can any of that used to test performance of the site, not necessarily load testing, just to see how long it takes for the site to load or see the response time?
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I know we can do lot more these days with modern browsers today. debug javascript, write data to console e.tc. 
Do they keep track of how long it takes to load the page or how long it takes to upload/download a document from the server and such. 
can any of that used to test performance of the site, not necessarily load testing, just to see how long it takes for the site to load or see the response time?

usability of modern browsers

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.