The Temporal proposal provides a replacement for Date, a long standing pain-point in the JavaScript language. This blog post describes some of the history and motivation behind the proposal. The Temporal API itself is well docmented on MDN. Temporal reached Stage 3 of the TC39 process in March 2021. Reaching Stage 3 means that the specification is considered complete, and that the proposal is read
JSer.info #678 - Firefox 122.0がリリースされました。 Firefox 122.0, See All New Features, Updates and Fixes Firefox 122 for developers - Mozilla | MDN <select>の子要素として<hr>を許可するように、CSSのoffset-positionとoffset-pathプロパティをデフォルトで有効化されています。 ArrayBuffer.prototype.transfer()の実装、XSSの対策としてSVGの<use>にData URLを利用できないように変更されています。 また、実験的な機能としてDeclarative shadow DOM、Popover API、Clipboard API、Intl.Segmenterが実装されています。 Deno 1.40
JSer.info #674 - date-fns v3.0.0がリリースされました。 Release v3.0.0 · date-fns/date-fns ESMとCJSのdual pacakgeに変更、それぞれのファイルはnamed exportするように変更されています。 また、TypeScriptの型を改善に合わせて、引数の数のRuntime Checkを無くしてType Checkのみに変更されています。 そのほかには、intervalオプションの負数をサポート、IEのサポートを終了などの変更も含まれています。 Firefox 121がリリースされました。 Firefox 121.0, See All New Features, Updates and Fixes Firefox 121 for developers - Mozilla | MDN <iframe loading
Speedometer 3 is a cross-industry effort to build a modern browser benchmark rooted in real-world user experiences. Its goal is to focus browser engineering effort towards making the Web more smooth for actual users on actual pages. This is hard to do and most browser benchmarks don’t do it well, but we see it as a unique opportunity to improve responsiveness broadly across the Web. This requires
JSer.info #654 - Riot.js v9.0.0がリリースされました。 Release Evergreen · riot/riot このリリースでは、Riot.jsとcompilerなどのバージョンを合わせるため、v8はスキップしてv9.0.0としてリリースされています。 Node.js 14/16のサポート終了、BabelでのTranspileをしないように変更、boolean属性の挙動変更などが含まれています。 Firefox 116がリリースされました。 Firefox 116.0, See All New Features, Updates and Fixes Firefox 116 for developers - Mozilla | MDN HTTP/2のアップロードパフォーマンスの改善、CSP3 external hashesをサポート。 FetchのgetRe
Welcome! SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI; see our online demo. What's New Read more in the SpiderMonkey Blog SpiderMonkey Internals Understanding the engine O
At Mozilla, we want the web to be capable of running high-performance applications so that users and content authors can choose the safety, agency, and openness of the web platform. One essential low-level building block for many high-performance applications is shared-memory multi-threading. That’s why it was so exciting to deliver shared memory to JavaScript and WebAssembly in 2016. This provide
Background: RegExps in SpiderMonkey Regular expressions – commonly known as RegExps – are a powerful tool in JavaScript for manipulating strings. They provide a rich syntax to describe and capture character information. They’re also heavily used, so it’s important for SpiderMonkey (the JavaScript engine in Firefox) to optimize them well. Over the years, we’ve had several approaches to RegExps. Con
The following is a changelog for JavaScript 1.6. This version was included in Firefox 1.5 (Gecko 1.8), which was released in November 2005. The corresponding ECMA standard is ECMA-262 Edition 3 and ECMAScript for XML (E4X) with some additional features. Several new features were introduced: E4X, several new Array methods, and Array and String generics.
The Baseline Interpreter: a faster JS interpreter in Firefox 70 Introduction Modern web applications load and execute a lot more JavaScript code than they did just a few years ago. While JIT (just-in-time) compilers have been very successful in making JavaScript performant, we needed a better solution to deal with these new workloads. To address this, we’ve added a new, generated JavaScript byteco
Starting with Firefox 66, timers added with the window.setTimeout or window.setInterval method during page load will be given a low priority and deferred until an idle time is available or the loading is complete. While this change aims at improving the performance of complex web applications like Google Docs, unexpected race conditions could occur if the initialization code is not designed proper
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. * Some parts of this feature may have varying levels of support. Learn more See full compatibility Report feedback The <script> HTML element is used to embed executable code or data; this is typically used to embed or refer to JavaScript code. The <script> ele
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