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Life & fun · January 10, 2016

Feature.js

A feature detection library in 1kb

Feature.js launched on January 10, 2016 with 12 votes, #2,087 of 4,523 launches that month. The site was still online in September 2026, 10 years on.

What it does

Feature.js is a fast, simple and lightweight browser feature detection library. It has no dependencies and weighs only 1kb minified and gzipped.

Feature.js is a fast, simple and light&shy;weight browser feature detec&shy;tion library. It has no dependencies and weighs only 1kb minified and gzipped. Feature.js automati&shy;cally initia&shy;lizes itself on page load, so you don’t have to. It doesn’t, however, run any tests while ini&shy;tia&shy;lizing, so it will only ever run them when you ask it to. This makes it perform very fast. With Feature.js , it’s simple to build progres&shy;sively enhanced expe&shy;riences that use feature detection to determine if a code can be execu&shy;ted in the user’s browser. First, include the script some&shy;where on your page — usually either in the <head> or just before the </body> closing tag. No…from featurejs.com

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