Feedback & States

Denied

Red no-entry disk head-shakes with decaying sine spring and lateral buzz; impact sparks radiate on first beat. Initial demo stops after first input; click or keyboard activation runs finite feedback.

cssmedium complexitymoderate motionclickmobile-ready

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Live demo — the real component, running in a sandbox. One self-contained HTML file, zero dependencies. Open it on the canvas →

When to use it

Form rejection, access-denied gates, locked-action confirmations where a tactile "no" reinforces the message.

When not to

Calm or neutral feedback contexts. Avoid for users with vestibular sensitivity — the buzzing reads as harsh.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Change shake amplitude from 13 degrees to 8, reduce buzz duration to 400ms (var dur = 400), and swap the red accent to orange (#f97316). Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.

Safe to edit

shake angle (rot = s*13)
buzz duration (var dur = 620)
auto-demo interval (idle > 1900)
spark opacity peak (0.85)
red accent color (--red:#e2473d)
theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

IIFE wrapper
prefers-reduced-motion early-return guard
visibilitychange pause/resume
aria-live polite status region
theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)
demo-v1 preview lifecycle: initialize demoEnabled from window.__foreverPreview and stop attract work on the window forever:interactive event; retain manual feedback, settling, cleanup and explicit sessions

Known limitations

CSS reduced-motion rule only applies to CSS animations; JS animation is guarded separately via matchMedia check
Sparks are seizure-safe by design — do not increase sp peak opacity above ~0.9
State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

deniedfeedbackshakeno-entryerror-statespringmicrointeraction

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