The element() CSS function defines an <image> value generated from an arbitrary HTML element. This image is live, meaning that if the HTML element is changed, the CSS properties using the resulting value are automatically updated.
CSS selectors - CSS | MDN
The CSS selectors module defines the patterns to select elements to which a set of CSS rules are then applied along with their specificity. The CSS selectors module provides us with more than 60 selectors and five combinators. Other modules provide additional pseudo-class selectors and pseudo-elements.
Pseudo-classes - CSS | MDN
A CSS pseudo-class is a keyword added to a selector that lets you select elements based on information that lies outside of the document tree, such as a specific state of the selected element(s). For example, the pseudo-class :hover can be used to style a button when a user's pointer hovers over it.
Practical guide to the <img> element: from the basics to LCP | Joan León
The <img> element has attributes that make a real difference in performance: loading, decoding, fetchpriority, srcset and sizes. A practical guide to using them well.
CSS Anchor Positioning Guide | CSS-Tricks
Learn about CSS Anchor Positioning, including its syntax, properties, how it is used to position one element next to another, and even how it's used to resize elements relative to other elements.
When and how to use the section element
So what on earth is a <section> element actually for? The answer isn’t as obvious as you might have hoped, but it’s definitely straightforward.
<dialog> HTML dialog element - HTML | MDN
The <dialog> HTML element represents a modal or non-modal dialog box or other interactive component, such as a dismissible alert, inspector, or subwindow.
una.im | Modern CSS theming with light-dark(), contrast-color(), and style queries
Combine three new CSS features to build fully adaptive themed components.
@function — Native Custom Functions in CSS
CSS now has user-defined functions. No preprocessor, no JavaScript, but native @function with typed parameters, local variables, and conditional logic built right into your CSS.
box-sizing CSS property - CSS | MDN
The box-sizing CSS property sets how the total width and height of an element is calculated.
Element: pointerrawupdate event - Web APIs | MDN
The pointerrawupdate event is fired when a pointer changes any properties that don't fire pointerdown or pointerup events. See pointermove for a list of these properties.
The CSS Selection - 2026 Edition - Project Wallace
The CSS Selection shows real-world CSS usage from over 100,000 websites and looks at the most important metrics.
My HTML boilerplate in 2026 - Manuel Matuzović
Every element I use for the basic structure of a HTML document, with explanations why.
My HTML boilerplate in 2026 - Manuel Matuzović
Every element I use for the basic structure of a HTML document, with explanations why.