CSS大解剖 1日目: 「仕様書ã€
本稿ã¯ã€2024å¹´2æœˆé ƒã«æ›¸ã溜ã‚ã¦ã„ãŸã‚·ãƒªãƒ¼ã‚ºã§ã™ã€‚最後ã¾ã§æ¸©å˜ã•ã›ã‚‹ã®ãŒå‹¿ä½“ãªã„ã®ã§ã€æœªå®Œæˆã§ã™ãŒãã®ã¾ã¾å…¬é–‹ã—ã¾ã™(公開日: 2025/9/21)。ãã®ãŸã‚ã€å†…容ã®é‡è¤‡ã‚„記述方é‡ã®ä¸ä¸€è‡´ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€ã”ç†è§£ãã ã•ã„。 CSSã®ä»•æ§˜ã‚’ç†è§£ã™ã‚‹ãŸã‚ã«ã€1æ—¥ã”ã¨ã«ãƒ†ãƒ¼ãƒžã‚’決ã‚ã¦èª¬æ˜Žã™ã‚‹ä¼ç”»1日目ã§ã™ã€‚今日ã®ãƒ†ãƒ¼ãƒžã¯ã€Œä»•æ§˜æ›¸ã€ã§ã™ã€‚ 仕様書 CSSã¯Webã®æ¨™æº–化団体ã§ã‚ã‚‹W3Cã«ã‚ˆã£ã¦æ¨™æº–化ã•ã‚Œã€å„ブラウザベンダã«ã‚ˆã£ã¦å®Ÿè£…ã•ã‚Œã¦ã„ã‚‹è¦æ ¼ã§ã™ã€‚ 標準化ã—ã¦æŒ™å‹•ã‚’仕様書ã¨ã—ã¦æ›¸ãèµ·ã“ã™ã“ã¨ã«ã‚ˆã£ã¦ã€Webブラウザ間ã®ç›¸äº’é‹ç”¨æ€§ãŒé«˜ã¾ã‚Šã€Web開発者も互æ›æ€§ã®é«˜ã„記述を心掛ã‘ã¦CSSを書ãã“ã¨ãŒã§ãるよã†ã«ãªã‚Šã¾ã™ã€‚ ã¨ã¯ã„ãˆã€ä»•æ§˜æ›¸ã¨å®Ÿè£…ã®é–¢ä¿‚ã¯å¿…ãšã—も一方å‘çš„ã§ã¯ã‚ã‚Šã¾ã›ã‚“。「仕様書ã«è¨˜è¼‰ã•ã‚Œã‚‹ → 実装ã•ã‚Œã‚‹ã€ã¨ã„ã†ã‚·ãƒ³ãƒ—ルãªé †ç•ªã§ã‚ã‚‹ã¨ã¯é™ã‚‰ãªã„ã®ã§ã™ã€‚実装ã•ã‚ŒãŸã‚‚ã®ã«ã‚ã‚ã›
Wasm 3.0 Completed - WebAssembly
Wasm 3.0 Completed Published on September 17, 2025 by Andreas Rossberg. Three years ago, version 2.0 of the Wasm standard was (essentially) finished, which brought a number of new features, such as vector instructions, bulk memory operations, multiple return values, and simple reference types. In the meantime, the Wasm W3C Community Group and Working Group have not been lazy. Today, we are happy t
CSS Environment Variables Module Level 1
CSS Environment Variables Module Level 1 Editor’s Draft, 26 October 2025 More details about this document This version: https://drafts.csswg.org/css-env-1/ Latest published version: https://www.w3.org/TR/css-env-1 Feedback: CSSWG Issues Repository Inline In Spec Editor: Tab Atkins-Bittner (Google) Former Editor: Dean Jackson (Apple) Suggest an Edit for this Spec: GitHub Editor Test Suite: https://
Make <img> src attribute optional if srcset is present · Issue #9181 · whatwg/html
https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element currently requires: The src attribute must be present, and must contain a valid non-empty URL potentially surrounded by spaces referencing a non-interactive, optionally animated, image resource that is neither paged nor scripted. and The srcset attribute may also be present, and is a srcset attribute. In other words, a va
RFC 1918: Address Allocation for Private Internets
[RFC Home] [TEXT|PDF|HTML] [Tracker] [IPR] [Errata] [Info page] BEST CURRENT PRACTICE Updated by: 6761 Errata ExistNetwork Working Group Y. Rekhter Request for Comments: 1918 Cisco Systems Obsoletes: 1627, 1597 B. Moskowitz BCP: 5 Chrysler Corp. Category: Best Current Practice D. Karrenberg RIPE NCC G. J. de Groot RIPE NCC E. Lear Silicon Graphics, Inc. February 1996 Address Allocation for Private
Standard Schema
Standard Schema is a common interface designed to be implemented by JavaScript and TypeScript schema libraries. The goal is to make it easier for ecosystem tools to accept user-defined type validators, without needing to write custom logic or adapters for each supported library. And since Standard Schema is a specification, they can do so with no additional runtime dependencies. Integrate once, va
Source map format specification
About this Specification The document at https://tc39.es/ecma426/ is the most accurate and up-to-date source map specification. It contains the content of the most recently published snapshot plus any modifications that will be included in the next snapshot. Contributing to this Specification This specification is developed on GitHub. There are a number of ways to contribute to the development of
Let’s Define CSS 4 · Issue #4770 · w3c/csswg-drafts
It’s come up quite a few times recently that the world of people who make websites would greatly benefit from the CSS Working Group officially defining â€CSS 4â€, and later “CSS 5“, etc. Chris Coyier wrote: CSS3, and perhaps to a larger degree, "HTML5", became (almost) household names. It was so successful, it's leaving us wanting to pull that lever again. It was successful on a ton of levels: • It
RFC 9557: Date and Time on the Internet: Timestamps with Additional Information
RFC 9557 Date and Time on the Internet: Timestamps with Additional Information Abstract This document defines an extension to the timestamp format defined in RFC 3339 for representing additional information, including a time zone.¶ It updates RFC 3339 in the specific interpretation of the local offset Z, which is no longer understood to "imply that UTC is the preferred reference point for the spec
Consensus in Internet Standards
Hi, I’m Mark Nottingham. I write about the Web, protocol design, HTTP, Internet governance, and more. This is a personal blog, it does not represent anyone else. Find out more. Comments? Let's talk on Mastodon. @mnot@techpolicy.social other Standards posts The Nature of Internet Standards (series) RFC 9518 - What Can Internet Standards Do About Centralisation? Tuesday, 19 December 2023 RFC 8890 -
The HTTP QUERY Method
The HTTP QUERY Method Abstract This specification defines a new HTTP method, QUERY, as a safe, idempotent request method that can carry request content.¶ Editorial Note This note is to be removed before publishing as an RFC.¶ Discussion of this draft takes place on the HTTP working group mailing list (ietf[email protected]), which is archived at https://lists.w3.org/Archives/Public/ietf-http-wg/.¶ W
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GitHub - evanw/kiwi: A schema-based binary format for efficiently encoding trees of data
Group Note: CSS Snapshot 2025
Introduce `moveBefore()` state-preserving atomic move API by domfarolino · Pull Request #1307 · whatwg/dom
First Public Working Draft: Web Audio API 1.1
GitHub - yaml/yaml-test-suite: Comprehensive, language independent Test Suite for YAML
CSS WG Blog – First Public Working Draft of CSS Grid Level 3 / Masonry Layout
Remove the UVM extension from WebAuthn L3 (potentially) · Issue #2069 · w3c/webauthn
GitHub - graphql/composite-schemas-wg: The GraphQL Composite Schemas WG (subcommittee)
Proposal: Support union scalar types · Issue #215 · graphql/graphql-spec
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