Modern CSS is evolving at an incredible pace, and by 2025, there will be many features that anyone working with web interfaces should be aware of. Over the past year, browsers have made great strides in supporting new specifications, and developers now have tools at their disposal that previously seemed impossible.
One notable innovation is the ability to animate transitions to values such as auto. Previously, this behavior had to be simulated using workarounds and JavaScript, but now browsers allow smooth transitions from a fixed height to a “natural” height without complicated workarounds. This makes interface animations more natural and clean.
Another important development is the emergence of popovers and callouts. Now you can create tooltips, modal windows, or small dialog elements natively, without complex scripts. This approach is convenient because it is initially available to all users and works even when JavaScript is disabled.
CSS is becoming more and more like a programming language, and this is clearly evident in the new @function rule. It allows you to create your own functions, move repetitive logical constructs into separate blocks, and reuse them, following the DRY principle. And with the if() function, it is now possible to add simple logic to CSS—for example, to use different property values depending on conditions.
An interesting innovation has also appeared for forms. The field-sizing property allows elements such as text fields to automatically adjust to their content. Now you can make the height of a field increase as text is entered, without using JavaScript.
Major changes have also been made to standard HTML elements. It is now possible to completely style drop-down lists, including their expandable parts, which was previously impossible without resorting to tricks. As a result, form elements have become more flexible and manageable. Typography has also been improved. The text-wrap property helps improve the visual perception of text by making lines more balanced or “beautiful.” This is especially useful for headlines and long texts—now the browser can automatically select the optimal word breaks to improve readability. Animations in CSS have also become richer. The linear() function has opened up new possibilities for creating smooth transitions of any complexity, allowing more points to be used to define the trajectory of movement. Now you can create realistic bounce and elasticity effects without third-party libraries. The shape() function has become a modern alternative to path() and allows you to work with shapes in adaptive units. It makes it possible to create complex shapes for cropping or animating elements without using SVG. This expands the boundaries of visual design directly in CSS.
The attr() function can now extract not only strings, but also numbers or colors from HTML attributes. This simplifies the transfer of data from markup to styles, making interfaces more dynamic and flexible.
The reading-order property has also been added, which solves the long-standing problem of inconsistency between the visual and logical order of elements. Now you can change the layout of blocks without losing correct keyboard navigation, which is especially important for accessibility.
There are even more interesting changes ahead for CSS. A native masonry grid, random() and sibling-index() functions, as well as properties such as margin-trim and an improved calc() with support for multiplication and division with units of measurement are expected to appear soon.
CSS is becoming an increasingly powerful tool for creating responsive, expressive, and accessible interfaces. Container queries, the :has() pseudo-class, view transitions, and anchor positioning are all already in practical use. Today’s CSS is not just a styling language, but a full-fledged environment for designing dynamic and responsive user interfaces.