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The w3c resource Timing API gives a mechanism to find the timing details of loading a resource like .js, .css, .gif, font, etc. However, current implementations haven't yet implemented returning the size of the resource (http://www.w3.org/TR/resource-timing/#performanceresourcetiming transferSize).

Till the time browser vendors implement the attribute "transferSize", how are application developers or tool vendors to determine the size of a given resource?

anjanb
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As far as I know you cannot use JavaScript to access resources length. The only ways that I found using scripts are with PHP, for example this old StackOverflow question that basically describes this method as the best to retrieve the length of remote files, such as css, js, etc. without downloading them. As you said it hasn't been implemented yet a property to access the size of the files. I also link you this other StackOverflow question because it mentions a tool developed by Google called speedtracer that allows you to analyze your page loading time and other things.

I hope this helped you :)

Community
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