Nudge Forward / Backward

The button label slides out and an arrow and fill expand in when hovered.

Add an "Interactive Hover Button" effect to [where].
The small dot beside the label should expand to fill the button while the label slides out to the side and fades, and the label with an arrow slides in over the new fill: smooth and quick.
Keep the button size fixed and the label readable throughout, and show the same effect on keyboard focus.

The element rises upward a few pixels on hover, as if floating.

Add a "Float" hover effect (also called lift or raise) to [where].
The element should rise up a little and stay raised while the pointer is over it, then settle back when it leaves: smooth and gentle, with no bounce.
Move it visually without shifting the surrounding layout, and show the same effect on keyboard focus.

An icon drops out of view and comes back from above on hover.

Add an "Icon Drop" hover effect to [where].
The icon inside the element should drop down out of view and then fall back into place from above: quick, with a soft landing.
Play it once each time the pointer enters rather than looping, and keep the label and button size unchanged.

An outline grows outward from or shrinks toward the element on hover.

Add an "Outline Expand" hover effect to [where].
An outline should start flush with the element's edge and move outward to leave a small gap around it, staying there while hovered and closing back in when the pointer leaves: smooth and quick.
Draw the outline so it doesn't change the element's size or push nearby content, and show the same effect on keyboard focus.

A line grows above the text from the left, center, or right on hover.

Add an "Overline Grow" hover effect to [where].
A line above the text should grow outward from the center to both sides while the pointer is over it, and shrink back to the center when it leaves: quick and smooth.
Reserve space for the line so the text doesn't shift, and show the same effect on keyboard focus.

The element quickly scales up and settles back with a springy pop.

Add a "Pop" hover effect to [where].
Each time the pointer enters, the element should swell up once quickly and settle back to its normal size, like a small springy pop.
Play it once per hover rather than holding the larger size or looping, and keep the surrounding layout from shifting.