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webpagetest.org I use it extensively to test loading times for both resources and javascript. In the waterfall chart in the results, there are bars that go vertically down. They indicate when certain things happen such as when painting starts, and when the DOM is interactive and has completely loaded. If you need finer tuning, what I would suggest is to ...


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The page is only fully loaded when all linked resources (including <script async defer) have loaded. This is when the onload event fires. However, the DOMContentLoaded event is likely to fire before this - which will probably be before the async defer scripts have loaded. (I say "probably" - if the browser is able to determine that it can load the script ...



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