


Weekly Platform News: Focus Rings, Donut Scope, More em Units, and Global Privacy Control
Mar 26, 2025 am 10:33 AMThis week's web development news covers significant updates across various platforms. Key highlights include Chrome's handling of focus rings, the enhanced capabilities of the CSS :not()
selector, major adoption of Global Privacy Control (GPC), and a compelling argument for em-based media queries. We also explore a CSS solution to improve form validation styling.
Chrome's Focus Ring Behavior Changes
Chrome, Edge, and other Chromium-based browsers currently display focus rings on button clicks. This differs from Safari and Firefox, which only show focus rings when keyboard navigation is used. Developers have employed workarounds using data-whatintent
and :focus-visible
to manage this behavior. However, Chrome 90 will eliminate the need for these workarounds by changing its user agent stylesheet to prioritize :focus-visible
, thus suppressing focus rings on clicks and taps while preserving them for keyboard users.
Leveraging CSS :not()
for "Donut Scope" Selection
The A:not(B *)
selector pattern allows selecting all A
elements not descended from B
. Expanding this to A B:not(C *)
creates a "donut scope," enabling precise selection of elements within a specific context, excluding those within a nested element. For example, article p:not(blockquote *)
selects all paragraphs within an article, excluding those inside blockquotes.
Global Privacy Control Gains Traction
Global Privacy Control (GPC), a legally enforceable privacy signal using the Sec-GPC: 1
header, signals user preference against data sharing or sale. The New York Times is the first major publisher to fully support GPC, with others like The Washington Post and Automattic pledging support shortly. When a GPC signal is detected, compliant sites will cease sharing user data (excluding service providers) where relevant privacy laws apply.
The Advantages of em-Based Media Queries
Websites using pixel-based font sizes (font-size: 20px
) are unresponsive to browser-level font size adjustments. Using em
and rem
units allows responsiveness to user preferences. For consistent behavior, media queries should also use em
units (e.g., min-width: 80em
). This ensures responsive layouts adapt correctly even when users adjust their default font size, preventing issues like excessively short lines in multi-column layouts. A PostCSS plugin simplifies the conversion from px
to em
in media queries.
Improving Form Validation Styling with :user-invalid
The standard CSS :invalid
pseudo-class has limitations in form validation. It triggers on every keystroke and immediately on page load for required fields, potentially causing a confusing user experience. The :user-invalid
pseudo-class, already supported in Firefox as :-moz-ui-invalid
, addresses these issues by only applying after significant user interaction. Efforts are underway to standardize :user-invalid
across other browsers.
The above is the detailed content of Weekly Platform News: Focus Rings, Donut Scope, More em Units, and Global Privacy Control. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

There are three ways to create a CSS loading rotator: 1. Use the basic rotator of borders to achieve simple animation through HTML and CSS; 2. Use a custom rotator of multiple points to achieve the jump effect through different delay times; 3. Add a rotator in the button and switch classes through JavaScript to display the loading status. Each approach emphasizes the importance of design details such as color, size, accessibility and performance optimization to enhance the user experience.

To deal with CSS browser compatibility and prefix issues, you need to understand the differences in browser support and use vendor prefixes reasonably. 1. Understand common problems such as Flexbox and Grid support, position:sticky invalid, and animation performance is different; 2. Check CanIuse confirmation feature support status; 3. Correctly use -webkit-, -moz-, -ms-, -o- and other manufacturer prefixes; 4. It is recommended to use Autoprefixer to automatically add prefixes; 5. Install PostCSS and configure browserslist to specify the target browser; 6. Automatically handle compatibility during construction; 7. Modernizr detection features can be used for old projects; 8. No need to pursue consistency of all browsers,

Use the clip-path attribute of CSS to crop elements into custom shapes, such as triangles, circular notches, polygons, etc., without relying on pictures or SVGs. Its advantages include: 1. Supports a variety of basic shapes such as circle, ellipse, polygon, etc.; 2. Responsive adjustment and adaptable to mobile terminals; 3. Easy to animation, and can be combined with hover or JavaScript to achieve dynamic effects; 4. It does not affect the layout flow, and only crops the display area. Common usages are such as circular clip-path:circle (50pxatcenter) and triangle clip-path:polygon (50%0%, 100 0%, 0 0%). Notice

Themaindifferencesbetweendisplay:inline,block,andinline-blockinHTML/CSSarelayoutbehavior,spaceusage,andstylingcontrol.1.Inlineelementsflowwithtext,don’tstartonnewlines,ignorewidth/height,andonlyapplyhorizontalpadding/margins—idealforinlinetextstyling

Setting the style of links you have visited can improve the user experience, especially in content-intensive websites to help users navigate better. 1. Use CSS's: visited pseudo-class to define the style of the visited link, such as color changes; 2. Note that the browser only allows modification of some attributes due to privacy restrictions; 3. The color selection should be coordinated with the overall style to avoid abruptness; 4. The mobile terminal may not display this effect, and it is recommended to combine it with other visual prompts such as icon auxiliary logos.

TheCSSPaintingAPIenablesdynamicimagegenerationinCSSusingJavaScript.1.DeveloperscreateaPaintWorkletclasswithapaint()method.2.TheyregisteritviaregisterPaint().3.ThecustompaintfunctionisthenusedinCSSpropertieslikebackground-image.Thisallowsfordynamicvis

To create responsive images using CSS, it can be mainly achieved through the following methods: 1. Use max-width:100% and height:auto to allow the image to adapt to the container width while maintaining the proportion; 2. Use HTML's srcset and sizes attributes to intelligently load the image sources adapted to different screens; 3. Use object-fit and object-position to control image cropping and focus display. Together, these methods ensure that the images are presented clearly and beautifully on different devices.

Different browsers have differences in CSS parsing, resulting in inconsistent display effects, mainly including the default style difference, box model calculation method, Flexbox and Grid layout support level, and inconsistent behavior of certain CSS attributes. 1. The default style processing is inconsistent. The solution is to use CSSReset or Normalize.css to unify the initial style; 2. The box model calculation method of the old version of IE is different. It is recommended to use box-sizing:border-box in a unified manner; 3. Flexbox and Grid perform differently in edge cases or in old versions. More tests and use Autoprefixer; 4. Some CSS attribute behaviors are inconsistent. CanIuse must be consulted and downgraded.
