Both Chrome and Firefox have improved the performance of the reload button. Chrome no longer revalidates subresoruces on reloads. Firefox supports the cache-control:immutable header as a way for sites to signal that they do not want their sub resources revalidated before their expiration
Facebook's internal statistics show that browsers that do not support this behavior cause 10-20% more requests for JS/CSS because users use the reload button to refresh the site.21 votes
cache-control:immutable shipped with Edge 15 in the recent Windows 10 Creators Update.
More effective lossless compression algorithm than gzip and deflate.696 votes
Brotli is included in Edge 15, which shipped today (11th April) with Windows 10 Creators Update.
Cache API is included in EdgeHTML 17 released today (30/04/2018)
This shipped today with EdgeHTML14, as part of the Windows 10 Anniversary update.
WebRTC is included in Edge 15, which shipped today (11th April) with Windows 10 Creators Update.
Every common browser has HSTS protocol implemented which means that they are more secure.23 votes
Subresource Integrity defines a mechanism by which user agents may verify that a fetched resource has been delivered without unexpected manipulation. In a nutshell, metadata inlined into HTML elements allows the browser to determine whether the resource that was downloaded matches the resource the page's author expected to download.2,415 votes
Subresource Integrity is included in EdgeHTML 17 released today (30/04/2018)
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