Fade In / Out

You might say

When the content changes, fade the old content out and the new content in.

Reveal or hide an element by changing its opacityA fade is a simple transition between transparent and visible states. It works for overlays, messages, and content replacement, but opacity alone does not explain where an element came from. Combine it with small spatial motion only when that adds useful context.

Know first

Opacity Transition

Frame indication: opacity 0 → 1, while gently moving up

You can say this to an AI Agent

Give the toast a brief opacity fade and remove it from hit testing and focus order after exit, so it cannot block the page. Support reduced motion and test entering, visible, exiting, and removed states.

When to use it

Show or hide an overlay
Replace a small piece of content
Slow entranceQuick exit
Introduce a toast or status message
The old fades out; the new fades in.
Soften a non-spatial state change
opacitytransform

When NOT to use it

Fade critical content so slowly that work is delayed
All statesAll statesIn progressThe menu only fades in place, with no origin or directional cue.
Use opacity to hide an element that remains unexpectedly interactive
fadeDuration too long
A fade-in that is too slow delays the sense that content is ready.
Combine large movement with every fade
At opacity: 0 it still takes up space and blocks clicks underneath.
Use repeated fades around text people are reading
Dialog fadeScale fadeSlide fade
Using only fades for every change weakens hierarchy and directional cues.

Anatomy

transform: translateY(8px)animation-duration: .2s

Opacity changes from 0 to 1, taking the element from transparent to visible

A small translate offset gives the entering element a more natural motion

There is no universal duration; choose one based on travel distance, task urgency, and reduced-motion preferences.

Variants

Pure Fade

For overlay or placeholder content that should appear without drawing attention

Fade In Up

For a card or modal entering the page

Cross Fade

For switching carousel or tab content

Typical use cases

Overlay

New project

The mask fades in synchronously with the pop-up window, and uses slight displacement to express the entry direction

Toast

✓ Saved Entry fade-in, the duration is adjusted according to the task

✓ Saved Exit fade-out, you can use a faster pace

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Old content (afterimage) fades out, new content fades in, and cross-fade does not interrupt the line of sight

Content swap

fade-in
300ms
→

Weekend hiking route

Read about 4 minutes

The first screen content fades in as a whole + moves up slightly, without flashing or jumping

Recommended tool

Web fine-tuning tool · Selector Pro

Select page elements for precise AI edits

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A toast only needs a light fade in and out, but after reaching zero opacity it still blocks a button underneath. How should it be fixed?

A. Transition opacity and remove hit testing, focus, and layout presence when exit completesB. Only set opacity to zero and keep the original layer and click areaC. Use pure fading for every overlay, including drawers that need to communicate a side origin