Tell people what is happening: success, warnings, errors, progress and loading states, announced to screen readers.
Inline alerts with optional actions and a close button.
Version 4.2 adds dark mode and faster search.
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Full-width notice at the top of a page or card.
Determinate bars and rings with labels.
Spinners, dots and a skeleton for content that is on its way.
Short confirmation that disappears on its own.