HTML Code Testing Waterfall Gap before the first request

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In HTML Code testing, there will be a gap at the beginning of the data download in the waterfall as shown in the below screenshot:

inline-830171889.png

Explanation

This gap is the client time (browser HTML/CSS/javascript process time.) In other words, this is the browser time taken to process the HTML page before calling the first resource. It is the same as the gap that we can see in normal web tests after the base HTML has downloaded and the gap can be longer if there is JavaScript to execute.