Dev.Opera — CSS will-changeプロパティについて知っておくべきこと
はじめにWebKit系ブラウザでCSS transformやanimationといったプロパティを使った時に発生する、“例のちらつき”。これに気づいたことのある人ならば、おそらく“ハードウェア・アクセラレーション”という用語をこれまでにも耳にしたことがあるでしょう。 CPU, GPU, ハードウェア・アクセラレーション一言で言うと、ハードウェア・アクセラレーションとは、グラフィックス・プロセッシング・ユニット（GPU）を用いてセントラル・プロセッシング・ユニット（CPU）の処理量を軽減し、ブラウザのレンダリング処理を効率化することです。ハードウェア・アクセラレーターを有効にしてCSS処理を使うと、ページのレンダリングが速くなり、ページ表示が高速化されます。 名前の通り、CPUとGPUはどちらもプロセッシング・ユニットです。CPUはコンピュータのマザーボードに取り付けられている部品で、ほとん
Dev.Opera — An introduction to the Web Bluetooth API
IntroductionThere is an explosion of electronic devices nowadays, and with many of them, it’s possible to interact with them via Bluetooth Low Energy, or BLE. However, installing a separate app for interacting with every single bluetooth gadget is impractical. What if we could communicate with them through a web browser? The Web Bluetooth API aims to do exactly that with a promise-based API, which
Dev.Opera — Responsive Images: What’s the Problem, and How Do We Fix It?
Responsive Images: What’s the Problem, and How Do We Fix It? IntroductionResponsive images is a surprisingly complicated topic, and one that's been steadily gaining attention over the last year as more developers discover they need them and then discover there's no good solution yet. This article aims to give an overview of the problem itself, and show the different proposals in the works to addre
Dev.Opera — Beautiful UI Styling With CSS3 text-shadow, box-shadow, and border-radius
Of course, in the real web most of us are stuck having to support Internet Explorer, which doesn’t yet support any of these properties. The best place to use them is therefore an environment where you can control what browser will be used. A prime example here is Opera Widgets, which run on the Opera core engine and therefore include modern browser features. An intranet is also a good example, so
Opera's Developer Relations Team - Opera 10.60 moves to the beta zone
8 March 2022 by Danny Yao in Blog By supporting the Opera Crypto Wallet, Dapp developers can gain access to millions of crypto users on Opera platform. To do so, Dapp developers need simply add a few lines of code to set up integration with the Opera Crypto Wallet. 23 January 2019 by Daniel Bratell in Blog Opera 58 (based on Chromium 71) for Mac, Windows, Linux is out! To find out what’s new for u
Dev.Opera — Automatic Numbering With CSS Counters
IntroductionWhen writing documents, it is often useful to number sections and have a table of contents. You can number these by hand, directly in the markup, but this can be time consuming if the order changes and you have to edit all the numbers. CSS 2.1 gives us an automated way to generate numbers using CSS counters, and this article will walk you through how to use them. One word of note befor
Dev.Opera — Setting Web Type to a Baseline Grid
IntroductionThis article covers the basics of baseline grids—defined grid areas within which content is placed—and how they can be applied effectively to the web medium. In print, baseline grids are almost mandatory. They ensure the bottom of each line of text—its baseline—aligns with a vertical grid, akin to writing on a ruled piece of paper. With books, this means text is always in the same posi
Rich HTML editing in the browser: part 1 - Opera Developer Community
LoginUser name: Password: Lost password? remember Sign upSign up now to post in the forums, comment on articles, submit your own articles and more. Rich HTML editing in the browser: part 1By Olav Junker Kj�r · 24 Jul, 2008Published in: contentEditable, selection, QueryCommand, range, designMode Introduction In the very first browser, created by Tim Berners-Lee in 1990, web pages could be edited di
Opera Widgets SDK - Opera Developer Community
LoginUser name: Password: Lost password? remember Sign upSign up now to post in the forums, comment on articles, submit your own articles and more. Table of contents Introduction Getting started Documentation Mobile and cross device development Tools Libraries Working with web technologies Web sites Introduction To download the widgets SDK, use this link. Opera Widgets are cross platform and cross
Opera Dragonfly 入門 (Japanese) - Opera Developer Community
LoginUser name: Password: Lost password? remember Sign upSign up now to post in the forums, comment on articles, submit your own articles and more. この記事は「Introduction to Opera Dragonfly」の日本語訳です。 【翻訳：利部直、上廣剛、アンドレアス・ボーヴェンス】 はじめに エキサイティングなニュースです！Opera Dragonfly が発表されました！Opera Dragonfly は Opera の提供する全く新しいウェブ開発ツールです。このアプリケーションは、ウェブ標準のデバック環境と問題解決のための効果的な仕組みを開発者に提供する軽快でパワフルなアプリケーションです。現在、以下の機能が提供されています：
The seven rules of unobtrusive JavaScript - Opera Developer Community
LoginUser name: Password: Lost password? remember Sign upSign up now to post in the forums, comment on articles, submit your own articles and more. The seven rules of unobtrusive JavaScriptBy Christian Heilmann · 19 Dec, 2007Published in: unobtrusive, javascript, DOM Introduction I've found the following rules over the years developing, teaching and implementing JavaScript in an unobtrusive manner
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File I/O API for widgets - Opera Developer Community
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