Chat client made entirely with CSS

Rob Beschizza 5:25 pm Tue May 7, 2019

CSS-only-chat uses no javascript and doesn't reload the page. It's amazing—and terrible. How is it done?

Background-images loaded via pseudoselectors + a forever-loading index page

In laypersons' terms: cover the page in elements, assign each one an individual background image, but only trigger the image when the mouse interacts with it. Voila: communication with a server without javascript or form submission. Other users get updates thanks to a HTML header that forces a page to render before it completes loading, so you can just keep appending new html to the end so long as you never stop sending data.

It's a total abomination and I love it.

It occurred to me that you can remotely monitor the cursor location without JS by using some CSS :hover selectors to change hidden background images (causing a GET request).

This should work on Tor as well and could be an interesting approach to tracking visitors.

— davy (@davywtf) May 3, 2019

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