23 September 2026

11 new posts across 3 web platform sources — 6 worth your time.

One week of Web & Frontend, 6 stories, as published.

WebKit Features for Safari 27.0

Safari 27.0 introduces 83 new features, including customizable <select> elements with new default styles and scroll anchoring. It also adds Safari MCP to improve compatibility with AI coding agents.

Why it matters — Customizable select elements allow for full restyling of native components while maintaining accessibility and platform behavior.

WebKit · 23 September 2026 · Read the original →

Browsers & Standards

Brighter Than White

Modern browsers like Chrome 137+ and Safari 26+ now support ISO 21496-1 gain maps to display HDR content on compatible screens. This technique uses a secondary data map to boost specific image colors beyond standard white levels.

Why it matters — Gain maps allow for high-dynamic-range highlights in web images by using a secondary data layer within standard image formats.

Frontend Masters · 23 September 2026 · Read the original →

CSS & Layout

Better Centering with CSS text-box

The text-box property in CSS addresses the long-standing issue of uneven vertical padding caused by font metrics. It allows developers to achieve precise centering in elements like buttons that remains consistent regardless of the specific font used.

Why it matters — The text-box property allows for consistent vertical padding across different fonts without requiring manual adjustments for font metrics.

Frontend Masters · 23 September 2026 · Read the original →

CSS & Layout

Extracting Grid Information Using CSS

This technical walkthrough demonstrates how to calculate grid metadata, such as column counts and item coordinates, using CSS math and variables. The approach relies on a responsive grid setup where items are automatically placed within defined column and gap sizes.

Why it matters — Mathematical derivation of grid state within CSS allows for calculating item coordinates and column counts without relying on JavaScript.

Frontend Masters · 23 September 2026 · Read the original →

Browsers & Standards

The Four Tiers of Tab Importance

The author discusses the transition between browsers like Arc, Zen, and Dia, noting that Arc remains functional despite its transition to Atlassian because it continues to receive Chromium engine updates. It explores the search for new tools that maintain specific tab management paradigms like the 'Four Tiers' system.

Why it matters — The continued viability of a browser often depends more on the maintenance of its underlying engine than on the addition of new user-facing features.

Chris Coyier · 23 September 2026 · Read the original →

Accessibility

New EU Accessibility Standard EN 301 549 v4.1.1

A new version of the European standard EN 301 549 (Version 4.1.1 (2026-09)) was published on September 2, 2026, and is expected to be published in the Official Journal of the European Union by late November 2026. This updated standard largely aligns with Web Content Accessibility Guidelines (WCAG) 2.2 A and AA, replacing the previous Version 3.2.1 (2021-03).

Why it matters — Websites and mobile applications serving European customers must prepare to meet the new EN 301 549 Version 4.1.1, which incorporates WCAG 2.2, as it becomes legally binding by late November 2026.

w3.org · 23 September 2026 · Read the original →

We have colors brighter than white, but centering text still requires a new specification.

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