CSS カスタムハイライト API
CSS カスタムハイライト API は、JavaScript を使用して範囲を作成し、CSS を使用してスタイルを設定することにより、文書内の任意のテキスト範囲のスタイル設定を行うためのメカニズムを提供しま���。
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Web APIs Server timing
Server-Timing is a part of the Performance API and allows servers to communicate metrics about the request-response cycle to the user agent. You can collect this information and act on server-side metrics in the same way as all the other metrics processed with the Performance API.
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JavaScript JavaScript resource management
This guide talks about how to do resource management in JavaScript. Resource management is not exactly the same as memory management, which is a more advanced topic and usually handled automatically by JavaScript. Resource management is about managing resources that are not automatically cleaned up by JavaScript. Sometimes, it's okay to have some unused objects in memory, because they don't interfere with application logic, but resource leaks often lead to things not working, or a lot of excess memory usage. Therefore, this is not an optional feature about optimization, but a core feature to write correct programs!
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developer.mozilla.org Launching MDN's new front end
MDN is getting a facelift 🎉. Discover what's changed, what's improved, and how navigating the site just got smoother.
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developer.mozilla.org Image formats: Pixel data from encoders to decoders
From individual pixels to fully decoded images on your screen, raw pixel data gets transformed, compressed, and efficiently delivered. Learn about the techniques and optimizations that shrink image information without any perceivable loss in quality.
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developer.mozilla.org Image formats: Color models for humans and devices
Images help bring more color and life to the web. This post describes how images are represented by humans and on different devices, with details about color spaces and vision theory.
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developer.mozilla.org Default styles for h1 elements are changing
Browsers are starting to roll out changes in default UA styles for nested section headings. This post describes the incoming changes, how to identify if it's an issue on your websites, and hints for conformant and better-structured pages.
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