How to Improve CSS Performance - Calibre
Combined with the complexity of modern websites and the way browsers process CSS, even a moderate amount of CSS can become a bottleneck for people who deal with constrained devices, network latency, bandwidth, or data limits. Because performance is a vital part of the user experience, it’s essential to make sure you deliver a consistent, high-quality experience across devices of all shapes and siz
Performance Impact of CSS Selectors | High Performance Web Sites
The second thing that concerned me was how small the baseline test page was, compared to the more complex pages. The main question I want to answer is “do inefficient CSS selectors slow down pages?” All five test pages contain 20,000 anchor elements (nested inside P, DIV, DIV, DIV). What changes is their CSS: baseline (no CSS), tag selector (one rule for the A tag), 20,000 class selectors, 20,000
表示速度を飛躍的に向上させるHTML/CSS最新仕様「content-visibility」「Lazy loading」「contain」をコード付き簡単解説
これまではJavaScriptを用いて実装するしかありませんでしたが、ついにimgやiframe要素であればloading="lazy"を付与するだけで、簡単に実装できます。 <!-- 画像に適用する場合 --> <img src="pic.png" alt="画像の詳細" loading="lazy"> <!-- iframeに適用する場合 --> <iframe src="external.html" loading="lazy"></iframe>画面外では読み込みが発生しないので、必要になった時（画面内に要素が入りそうになった時）に読み込みが発生するのでパフォーマンスが向上します。 また画像についてはsrcsetを用いたレスポンシブな画像に対しても指定できますし、picture要素を用いてfallback形式でも記述できます。 <img src="normal.png" srcse
Performance of CSS Variables
CSS variables have been around for a while. Although they still lack some Browser Support (mainly IE and Edge), they provide a great new way to structure and interact with your CSS. In order to take a closer look at the performance impact of CSS variables one has to understand the basic principle of the scope, because it also applies to CSS variables. TL;DR be aware of style recalculations, since
CSS Triggers List - What Kind of Changes You Can Make
• Layout • Paint • Composite align-content Changing align-content alters the geometry of the element. That means that it may affect the position or size of other elements on the page, both of which require the browser to perform layout operations. Once those layout operations have completed any damaged pixels will need to be painted and the page must then be composited together. align-items Changi
20 Tips for Optimizing CSS Performance — SitePoint
In this article, we look at 20 ways to optimize your CSS so that it’s faster-loading, easier to work with and more efficient. According to the latest HTTP Archive reports, the web remains a bloated mess with the mythical median website requiring 1,700Kb of data split over 80 HTTP requests and taking 17 seconds to fully load on a mobile device. The Complete Guide to Reducing Page Weight provides a
Critical CSS and Webpack: Automatically Minimize Render-Blocking CSS
Critical CSS and Webpack: Automatically Minimize Render-Blocking CSS "Eliminate render-blocking JavaScript and CSS". It's the one Google Page Speed Insights suggestion that I always get stuck with. When a web page is accessed, Google wants it to only load what's useful for the initial view, and use idle time to load anything else. That way, the user can see the page as early as possible. There are
ProCSSor - Advanced CSS Prettifier
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Ikemasa Blog - YUI Compressor GUI を作ってみました
いつも便利に使わせてもらっている YUI Compressor ですが、GUIもほしいなぁと思い、フロントエンドツールを作ってみました。 主な機能 1. ドラッグ&ドロップで圧縮元ファイルを指定 2. YUI Compressor 2.4.2の全オプションを指定可能 3. 圧縮状況の表示 4. 圧縮設定に名前をつけて保存 ダウンロード：YUI Compressor GUI 1.0.0 YUI Compressor GUI 画面 ファイルをドロップして、圧縮ボタンを押すだけです。簡単に使えます。 コンソールには、実行内容が表示されます。 動作環境 JRE 1.4以上 yuicompressor-2.4.2.jar インストール YUI Compressor GUI 1.0.0 をダウンロードして、適当な場所に展開します。 YUI Compressor 2.4.2 をダウンロ
CSS Sprite Generator, Editor, and Code
What are CSS Sprites CSS sprites are a way to reduce the number of HTTP requests made for image resources referenced by your site. Images are combined into one larger image at defined X and Y coorindates. Having assigned this generated image to relevant page elements the background-position CSS property can then be used to shift the visible area to the required component image. This technique can
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GitHub - FullHuman/purgecss: Remove unused CSS
The Simplest Way to Load CSS Asynchronously | Filament Group, Inc., Boston, MA
GitHub - filamentgroup/loadCSS: Load CSS asynchronously
Toolbox / BEM
Refresh-SF - Online JavaScript and CSS Compressor