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Gwtar: a static efficient single-file HTML format Fascinating new project from Gwern Branwen and Said Achmiz that targets the challenge of combining large numbers of assets into a single archived HTML file without that file being inconvenient to view in a browser. The key trick it uses is to fire window.stop() early in the page to prevent the browser from downloading the whole thing, then following that call with inline tar uncompressed content. It can then make HTTP range requests to fetch content from that tar data on-demand when it is needed by the page. The JavaScript that has already loaded rewrites asset URLs to point to https://localhost/ purely so that they will fail to load. Then it uses a PerformanceObserver to catch those attempted loads: let perfObserver = new PerformanceObserver((entryList, observer) => { resourceURLStringsHandler(entryList.getEntries().map(entry => entry.name)); }); perfObserver.observe({ entryTypes: [ "resource" ] }); That resourceURL...