Accessing a website you never visited before while being offline [demo]
This interactive demo explores how a website can load and function while you're in airplane mode — even if you've never visited it before. It requires official Google Chrome and does not work on iOS devices (iPhone/iPad). Spoiler alert: For the best experience, try the demo before reading the explanation below. You can launch it by clicking the post title at the top of this page. The demo uses SXG (Signed Exchanges), a web standard that allows Google to prefetch entire pages from search results. This means that when you click a result, the page can open even if you're offline — because…
Accessing a website you never visited before while being offline [demo] launched on April 9, 2025 with 25 votes, #802 of 7,818 launches that month and more than 90% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
This interactive demo showcases how webpages can load and function offline using Google Chrome, even on first visit. It demonstrates Signed Exchanges (SXG), a web standard that allows Google to prefetch complete pages from search results before you go offline. The demo pushes the technology by delivering a page containing a 19 MB video entirely through prefetching. It works only on Chrome desktop and not on iOS devices.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
This interactive demo explores how a website can load and function while you're in airplane mode — even if you've never visited it before. It requires official Google Chrome and does not work on iOS devices (iPhone/iPad). Spoiler alert: For the best experience, try the demo before reading the explanation below.…
Does a similar job
all alternatives →- OAOffline – Access your favorite websites without a network connection2015 · play.google.com · ▲69
- SASurfboard - A flippable way to experience the web in HTML5/CSS32011 · ridesurfboard.com · ▲18
I love to use Flipboard on my iPad, but I was bummed that the experience couldn't follow me to the phone or desktop, so I decided to do something about it... I built http://ridesurfboard.com over the winter holiday and just finished it up last night, so I wanted to share it with the HN community first. The app turns any website with an RSS feed into a more human, flippable format. It's all HTML5/CSS3/JS and works best in either desktop Safari or on an iOS device, although you can use Chrome if you enable the experimental GPU Accelerated Compositing flag (a how-to is on the Surfboard blog).…
Inspect – DevTool to debug Safari and WebViews on iOS devices2020 · inspect.dev · ▲75Agent-first mobile web debugging for iOS and Android. Give Claude, Codex, Cursor, and other coding agents real-device DOM, console, network, and screenshots.
- IWI write an iOS app to intercept all HTTP/HTTPS Traffic (Beta Testing)2021 · ▲9
Hi everyone, after months of hard-working, I'm glad to have something to show HN. It's an iOS app to help you directly capture and intercept HTTP/HTTPS Traffic from your iPhone/iPad with ease. It's suitable for any developers who would debug iOS without needing a computer. You can also share all traffic to Proxyman macOS via AirDrop for better previewing. - Please join a beta in TestFlight (iOS 14+): https://testflight.apple.com/join/nQ69eb35 - How it works if you don't have any devices: https://www.youtube.com/watch?v=UpzpoTN8efM&feature=youtu.be…
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Source: Show HN post ↗ · launch text quoted in part
Launched alongside, April 2025
the whole month →
Hi everyone, I built PyXL — a hardware processor that executes a custom assembly generated from Python programs, without using a traditional interpreter or virtual machine. It compiles Python -> CPython Bytecode -> Instruction set designed for direct hardware execution. I’m sharing an early benchmark: a GPIO test where PyXL achieves a 480ns round-trip toggle — compared to 14-25 micro seconds on a MicroPython Pyboard - even though PyXL runs at a lower clock (100MHz vs. 168MHz). The design is stack-based, fully pipelined, and preserves Python's dynamic typing without static type restrictions.…
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