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 light­weight browser feature detec­tion library. It has no dependencies and weighs only 1kb minified and gzipped. Feature.js automati­cally initia­lizes itself on page load, so you don’t have to. It doesn’t, however, run any tests while ini­tia­lizing, 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 progres­sively enhanced expe­riences that use feature detection to determine if a code can be execu­ted in the user’s browser. First, include the script some­where on your page — usually either in the <head> or just before the </body> closing tag. No…from featurejs.com
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