mathiasbynens

.files, including ~/.macos — sensible hacker defaults for macOS

A jQuery plugin that enables HTML5 placeholder behavior for browsers that aren’t trying hard enough yet

A robust HTML entity encoder/decoder written in JavaScript.

Smallest possible syntactically valid files of different types

Subtle and not-so-subtle shell tweaks that will slowly drive people insane.

A regular expression to match all Emoji-only symbols as per the Unicode Standard.

A robust Punycode converter that fully complies to RFC 3492 and RFC 5891.

Web developer tools

A Unicode-aware string reverser written in JavaScript.

Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.

A robust JavaScript implementation of a UTF-8 encoder/decoder, as defined by the Encoding Standard.

A robust base64 encoder/decoder that is fully compatible with `atob()` and btoa()`, written in JavaScript.

A robust polyfill for the CSS.escape utility method as defined in CSSOM.

jsPerf.com source code

Generate JavaScript-compatible regular expressions based on a given set of Unicode symbols or code points.

Simple PHP URL shortener, as used on mths.be

A source code transpiler that enables the use of ES2015 Unicode regular expressions in ES5.

A Lua minifier written in JavaScript

A small script that enables you to make typos in JavaScript property names. Powered by ES2015 proxies + Levenshtein string distance.

A JavaScript library for escaping CSS strings and identifiers while generating the shortest possible ASCII-only output.

A robust & optimized ES3-compatible polyfill for the `String.prototype.startsWith` method in ECMAScript 6.

This Grunt plugin interpolates template files with any data you provide and saves the result to another file.

A polyfill for document.scrollingElement as defined in the CSSOM specification.

Page Visibility shim for jQuery

A regular expression pattern for Java/JavaScript to match all emoji in the emoji-test.txt file provided by UTS#51.

World’s first <details>/<summary> polyfill™

Quick demonstration of why `<a rel=noopener>` is needed.

A robust & character encoding–agnostic JavaScript implementation of the `Quoted-Printable` content transfer encoding as defined by RFC 2045.

A Grunt plugin for compressing files using Zopfli.

regexpu’s core functionality, i.e. `rewritePattern(pattern, flag, options)`, which enables rewriting regular expressions that make use of the ES6 `u` flag into equivalent ES5-compatible regular...

Smooth anchor scrolling plugin for jQuery.

A robust & optimized ES3-compatible polyfill for the `String.prototype.contains` method in ECMAScript 6.

A robust & optimized ES3-compatible polyfill for the `Array.from` method in ECMAScript 6.

Custom QWERTY/AZERTY .keylayout files for use with Apple keyboards

Kali Linux Docker

The simplest jQuery slideshow plugin. Evar.

A robust & optimized `String.fromCodePoint` polyfill, based on the ECMAScript 6 specification.

A regular expression to match hashtag identifiers as per the Unicode Standard.

A Grunt plugin for compressing JavaScript and CSS files using YUI Compressor.

Python scripts that generate JavaScript-compatible Unicode data

A robust & optimized `String.prototype.codePointAt` polyfill, based on the ECMAScript 6 specification.

A robust & optimized ES3-compatible polyfill for the `String.prototype.at` proposal for ECMAScript 6/7.

Historical data on COVID-19 vaccination doses administered in Germany, per state.