How we use Web Components at GitHub
EngineeringHow we use Web Components at GitHubAt GitHub, we pride ourselves on delivering a first-class developer experience. A considerable part of our work is on our front end, which we strive to keep as lightweight, fast,… At GitHub, we pride ourselves on delivering a first-class developer experience. A considerable part of our work is on our front end, which we strive to keep as lightweight, f
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
Marginwidth/marginheight - the unexpected cross-origin communication channel - research.securitum.com
The code just iterates over all attributes of the <body> element and evaluates values of all these attributes as JavaScript. Because there was no other sources in the challenge, it meant that solving it requires finding a way to inject arbitrary attribute value into the document.body. So how’s that possible? It all started when I noticed an interesting snippet in the HTML specification. The 14th s
HTML Standard
'xxx-large' 15.3.5 Bidirectional text @namespace "http://www.w3.org/1999/xhtml"; [dir]:dir(ltr), bdi:dir(ltr), input[type=tel i]:dir(ltr) { direction: ltr; } [dir]:dir(rtl), bdi:dir(rtl) { direction: rtl; } address, blockquote, center, div, figure, figcaption, footer, form, header, hr, legend, listing, main, p, plaintext, pre, summary, xmp, article, aside, h1, h2, h3, h4, h5, h6, hgroup, nav, sect
GitHub - szimek/sharedrop: Easy P2P file transfer powered by WebRTC - inspired by Apple AirDrop
ShareDrop is a web application inspired by Apple AirDrop service. It allows you to transfer files directly between devices, without having to upload them to any server first. It uses WebRTC for secure peer-to-peer file transfer and Firebase for presence management and WebRTC signaling. ShareDrop allows you to send files to other devices in the same local network (i.e. devices with the same public
aria-live属性 | HTMLリファレンス
aria-live属性は内容が更新された際にユーザーに伝達するかどうかを指定できるWAI-ARIA属性です。 aria-live属性には以下の値を指定することができます。 値 内容 off 内容が更新されてもユーザーに伝達しない(デフォルト) polite 現在の読み上げの終了やユーザー入力時など適切なタイミングで、内容が更新されたさいにユーザーに伝達する。 assertive 即座に伝達を行う 以下のサンプルではprogress要素の進歩度をJavaScriptなどで逐次変更し、100%になったタイミングで読み込み終了のメッセージを表示するサンプルです。 progress要素にはaria-live=”polite”を指定しててきじ進歩度をユーザーに伝達し、読み込み終了のメッセージにはaria-live=”assertive”を指定して即座にユーザーに伝達できるようになっています。 <pr
Using the `for` Attribute on the `output` Element in HTML5
There are two things here that you’re probably already aware of. First, HTML includes an <output> element that allows you to display the “result of a calculation”. It’s a form element and it’s been around for some time, having been added in HTML5. The other thing you’re likely to be aware of is that the for attribute is normally used on the <label> element to associate a <label> with a form elemen
HTML Imagemap Generator
矩形、または、円を描く場合は、ツールを選択後に画像上でドラッグしてください。作成済みのシェイプをクリックするとサイズや位置の調整ができます。 多角形を描く場合は、ツールを選択後に画像上でクリックしてください。2つめの頂点が確定すると、マウス移動時に対象エリアを確認できるようになります。 escape キーで多角形の作成モードを終了します。作成済みのシェイプをクリックすると位置の調整ができます。
HTML 5.2: 4.13. Common idioms without dedicated elements
Table of contents 1 Introduction2 Common infrastructure3 Semantics, structure, and APIs of HTML documents4 The elements of HTML5 Microdata6 User interaction7 Loading web pages8 Web application APIs9 Communication10 Web workers11 Worklets12 Web storage13 The HTML syntax14 The XML syntax15 Rendering16 Obsolete features17 IANA considerationsIndexReferencesAcknowledgmentsIntellectual property rights F
W3Schools Online Web Tutorials
W3Schools offers a wide range of services and products for beginners and professionals, helping millions of people everyday to learn and master new skills. Free Tutorials Enjoy our free tutorials like millions of other internet users since 1999
Using ARIA
Using ARIA W3C Working Draft 04 May 2017 This version: https://www.w3.org/TR/2017/WD-using-aria-20170504/ Latest published version: https://www.w3.org/TR/using-aria/ Latest editor's draft: https://w3c.github.io/using-aria/ Previous version: https://www.w3.org/TR/2017/WD-aria-in-html-20170418/ Editors: Steve Faulkner, The Paciello Group, sfaulkner@paciellogroup.com David MacDonald, CanAdapt Solutio
Slides - Free Static Website Generator and Landing Page Builder
Static website generator, create websites easily. Generate beautiful, animated, static websites with your creative direction in a matter of minutes. Yes, minutes. Open the App →Pricing What is inside Catapult your idea with a sleek presentation. Mix and match the layout from a huge collection of slides, that elegantly present your idea with taste and aesthetics. Update Templates. Fast and beautifu
HTML Plan
This is work in progress. It has only been looked at by Sam, Paul, PLH, and Robin. This document has no official status and was simply produced in response to a request from the AB. Some elements of this plan have been rejected previously and could undergo substantial changes before coming into effect. Between the enactment of “Plan 2014” and the release of HTML 5.0 as a Recommendation, the HTML W
runstant
html html style css script javascript html style script tmlib.js 入門 console about blog twitter Setting Project Project Title Description Language html style script User User Name Theme (default:monokai) tab size (default:4) font size (default:12) Key Binding(default:ace) Share Short URL Embed Code Social Twitter Facebook Google+ Pocket Hatebu Other Fullscreen Download Template Common Default tmlib
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
web-platform-tests dashboard
AMP - a web component framework to easily create user-first web experiences
Progressive Web Apps | web.dev
The elements of HTML
Top Pens of 2015 on CodePen
GitHub - zource/zui: The pattern library of Zource.
