Progressive Disclosure

A vertical list of collapsible sections: clicking a header expands its content and clicking again collapses it, either exclusively (one open at a time) or independently. Packs grouped content into limited space for on-demand expansion.

Checks input validity during typing or at submit and surfaces errors right next to the offending field. The goal is to tell users, with minimal interruption and maximum locality, what went wrong and how to fix it — instead of bouncing them back with a page of errors after submit.

Introduces an interface with an overlay, a spotlight cutout and step bubbles: each step reveals one key area and explains it in place, paced by prev/next controls and a step indicator, always skippable. The explanation lives where the feature happens instead of making users hunt for docs.

A panel that slides in from a screen edge (usually right or left), usually with a backdrop. Lighter than a modal: it carries longer content without leaving the page, and closing restores the original context. On mobile it appears as a nav drawer or a bottom sheet.

A small text bubble that appears briefly on hover, explaining icon buttons, abbreviations or truncated text. Purely informational and non-interactive, it disappears on mouse leave; usually shows after a ~300ms delay to avoid flicker while moving across the screen.