Search results for “site:w3.org”

Selectors Level 4

that takes an element in a tree structure and tests whether the element matches the selector or not. These expressions may be used for many things: directly on an element to test whether it matches some criteria, such as in the element.matches() function defined in [DOM] applied to an entire tree...

CSS Generated Content for Paged Media Module

Paged media have many special requirements for the display of document content, which have evolved over the long history of printed books. Running headers and footers function as aids to navigation. Notes may appear at the bottom of the page, as footnotes. The properties of pages themselves may...

Namespaces in XML 1.0 (Third Edition)

Richard Tobin, University of Edinburgh and Markup Technology Ltd <richard@inf.ed.ac.uk> Henry S. Thompson, University of Edinburgh and W3C <ht@w3.org> - Third Edition Please refer to the errata for this document, which may include...

CSS Round Display Level 1

Conventionally, web pages have been shown through a rectangular screen such as PC, tablet, and smart phone. The window content area in a web browser is a rectangle. Each HTML element follows the W3C box model and thus is also a rectangle....

WebAssembly Core Specification

WebAssembly (abbreviated Wasm [1]) is a safe, portable, low-level code format designed for efficient execution and compact representation. Its main goal is to enable high performance applications on the Web, but it does not make any Web-specific assumptions or provide Web-specific features, so it...

In short: Learn about the latest WebAssembly Core Specification (W3C CR Draft, June 2025) - a low-level code format for efficient execution and compact representation.... (AI summary)

CSS Images Module Level 3

image values, such as those used in the background-image property, could only be given by a single URL value. This module introduces additional ways of representing 2D images, for example as a gradient. This module also defines several properties for manipulating raster images and for sizing or...

CSS Anchor Positioning

without regard to the layout of other boxes besides their containing block. This flexibility can be very useful, but also very limiting—​often you want to position relative to some other box. Anchor positioning (via the position-anchor and position-area properties and/or the anchor functions...

In short: Learn to position elements relative to anchors with this CSS Anchor Positioning tutorial. Improve your web design skills today! (AI summary)

EPUB 3.3

EPUB® 3 defines a distribution and interchange format for digital publications and documents. The EPUB format provides a means of representing, packaging, and encoding structured and semantically enhanced web content — including HTML, CSS,...

In short: Master EPUB 3.3: Learn to create digital publications with HTML, CSS, SVG, and more! This tutorial covers the latest version of the standard from W3C. (AI summary)

Cover page | xpath | W3C standards and drafts | W3C

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

CSS Gap Decorations Module Level 1

CSS Multicol 1 § 4 Column Gaps and Rules allows for rules to be drawn between columns in a multicol container. This specification expands upon the column-rule-width, column-rule-style, and column-rule-color properties, adding equivalents in the row direction, expanding their application to other...