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    @NiCkNewman Yes Size is the actual data size (not bandwidth btw) across the wire (Headers+Content combined). Content is the size of the inflated, uncompressed Content (e.g. if it was gziped) only (Headers excluded!). Commented May 24, 2015 at 11:01
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    Dumb question, but are we using 1000 KB per MB here, or 1024? Commented Mar 4, 2016 at 22:39
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    @ButtleButkus: Chrome, Firefox and IE/Edge all use the outdated JEDEC format, where a kilobyte is 1024 bytes and is written as KB. It would be better if they reported it either in ISO format (base 10) or write it as KiB/MiB. Commented Jun 15, 2016 at 13:43
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    I'm using Chrome Version 60.0.3112.113 (Official Build) (64-bit) on Mac and just came across this same question. The screenshots in this question are the only way I was able to determine what the difference between the gray and black numbers are. The current version of Chrome I'm using doesn't seem to show the subheading "Content". The column just says "Size". Is there somewhere in the docs or in Chrome that explains that the gray number is "Content". I can't find it anywhere. Commented Sep 19, 2017 at 0:09
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    Just a note that in new versions of chrome, the grey number doesn't show by default, you have to click the 'Use large request rows' button in the "View" bar up top Commented Mar 29, 2018 at 17:00