Button Loading State

A ring or arc rotates continuously to show that something is loading.

Add a "Circular Spinner" (also called a spinner or throbber) to [where].
An arc should rotate steadily around a faint ring while it stretches longer and shorter, smooth and continuous.
Keep the rotation seamless, give it a loading label for screen readers, and slow or stop it for users who prefer reduced motion.

The copy icon morphs into a checkmark and the label reads Copied for a moment.

Add a "Copy-to-Clipboard Feedback" animation (also called a copied state or copy icon to checkmark) to [where].
When the copy button is pressed, the copy icon should quickly shrink away as a checkmark draws in and the label changes to "Copied", then everything eases back after a short moment.
Keep the button the same size during the swap so nothing shifts, and announce the copied state to screen readers.

A circle and tick draw themselves to confirm an action succeeded.

Add a "Success Checkmark" animation (also called an animated success tick) to [where].
A circle should draw itself around in one smooth stroke, then the tick draws inside it and the whole mark gives a small, gentle pop: calm and confident.
Play it once when the action succeeds, pair it with a text message screen readers can announce, and show the finished mark right away for users who prefer reduced motion.

Holding an item down for a moment triggers extra actions or a progress fill.

Add a "Long Press" interaction (also called press and hold or touch and hold) to [where].
While the item is held down it should sink slightly as a progress fill sweeps across it at a steady pace, and when the fill completes it springs back and opens its menu; letting go early cancels and resets the fill.
Give keyboard and screen reader users another way to reach the same actions, and do not let the hold trigger text selection or the browser's own context menu.

A bar fills from left to right in proportion to task completion.

Add a "Determinate Progress Bar" (also called a progress bar fill or progress indicator) to [where].
The bar should fill from left to right in step with the real progress, easing smoothly between updates, with the percentage shown beside it.
Use proper progress bar semantics with current, minimum and maximum values so screen readers can read it, and never let the fill move backwards.

A bar segment sweeps repeatedly along a track when the duration is unknown.

Add an "Indeterminate Linear Progress" bar (also called an indeterminate progress bar) to [where].
A short segment should sweep along the track from one end to the other again and again, quick and smooth, while the length of the task is unknown.
Let the segment enter and leave the track completely so the loop has no visible seam, and mark it as a busy progress bar for screen readers.