Tell me about CSS properties that are better not to animate, and why. Which properties are better to animate?

It is better not to animate CSS properties that trigger style recalculations, reflow, and repaint of large areas of the page, as this heavily loads the browser and reduces performance.

Such properties include:

• width, height
• margin, padding
• top, left, right, bottom
• border-width
• font-size

Animating these properties causes the browser to recalculate the layout and sizes of elements, which is resource-intensive.

It is better to animate properties that are handled at the GPU level and do not cause reflow:

• transform (e.g., translate, scale, rotate)
• opacity

Example:

.element {
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.element:hover {
  transform: translateX(10px) scale(1.1);
  opacity: 0.8;
}

This approach provides smooth animation with minimal load on the browser.