A window.fetch JavaScript polyfill.
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Standard Library
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
A Javascript library for working with native objects.
Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers
Polyfill for the AbortController DOM API and abortable fetch (stub that calls catch, doesn't actually abort request).
Tiny library (<200B gzip) for deferring something by a "tick"
ES2017 spec-compliant shim for Object.values
ES2017 spec-compliant shim for Object.entries
Object.keys shim
Array.prototype.includes spec-compliant polyfill
An ESnext spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
Official ES spec-compliant polyfill for Object.fromEntries
ES5 spec-compliant shim for String.prototype.trim
A full-featured polyfill for customized built-in elements
ES2019 spec-compliant shim for String.prototype.trimRight.
Array.prototype.every spec-compliant polyfill
Array.prototype.some spec-compliant polyfill