Range Slider Hover Tooltip
A volume slider that thickens its track, rings the thumb in a halo and pops a value bubble above it on hover. The fill and the thumb both read one --v percentage, so they always line up.
Also known as: range slider tooltip css, slider thumb hover, volume slider hover.
HTML
<div class="hfx-range-slider-tooltip" role="img" aria-label="Volume at 64 percent"> <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 9.5v5h3.5L12 19V5L7.5 9.5zM15.5 9a4 4 0 0 1 0 6M18.5 6.5a7.5 7.5 0 0 1 0 11"/></svg> <span class="hfx-range-slider-tooltip-track"><span class="hfx-range-slider-tooltip-thumb" data-value="64"></span></span> </div>
CSS
.hfx-range-slider-tooltip {
--c: var(--hfx-color, #3b82f6);
--v: 64%;
font-size: var(--hfx-size, 16px);
display: flex;
align-items: center;
gap: 0.9em;
width: 16em;
color: var(--c);
font-family: system-ui, sans-serif;
}
.hfx-range-slider-tooltip > svg {
flex: none;
width: 1.35em;
height: 1.35em;
}
.hfx-range-slider-tooltip-track {
position: relative;
flex: 1;
height: 1.6em;
cursor: pointer;
}
/* the visible bar: filled part, then the rest */
.hfx-range-slider-tooltip-track::before {
content: "";
position: absolute;
left: 0;
right: 0;
top: 50%;
height: 0.4em;
margin-top: -0.2em;
border-radius: 99em;
background: linear-gradient(90deg, var(--c) var(--v), color-mix(in srgb, var(--c) 22%, transparent) var(--v));
transition: transform 0.25s ease;
}
.hfx-range-slider-tooltip-thumb {
position: absolute;
top: 50%;
left: var(--v);
width: 1.15em;
height: 1.15em;
margin: -0.575em 0 0 -0.575em;
border-radius: 50%;
background: #fff;
box-shadow: 0 0 0 0.2em var(--c), 0 0 0 0 color-mix(in srgb, var(--c) 20%, transparent), 0 0.15em 0.4em rgba(0, 0, 0, 0.3);
transform: scale(0.8);
transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}
/* value bubble and its arrow */
.hfx-range-slider-tooltip-thumb::after,
.hfx-range-slider-tooltip-thumb::before {
position: absolute;
left: 50%;
opacity: 0;
transition: opacity 0.2s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.hfx-range-slider-tooltip-thumb::after {
content: attr(data-value);
bottom: calc(100% + 0.75em);
min-width: 2.2em;
padding: 0.3em 0.45em;
border-radius: 0.45em;
background: var(--c);
color: #fff;
font-size: 0.8em;
font-weight: 700;
text-align: center;
transform: translate(-50%, 0.5em) scale(0.6);
transform-origin: 50% 100%;
}
.hfx-range-slider-tooltip-thumb::before {
content: "";
bottom: calc(100% + 0.35em);
border: 0.3em solid transparent;
border-top-color: var(--c);
transform: translate(-50%, 0.5em);
}
.hfx-range-slider-tooltip:hover .hfx-range-slider-tooltip-track::before { transform: scaleY(1.5); }
.hfx-range-slider-tooltip:hover .hfx-range-slider-tooltip-thumb {
transform: scale(1);
box-shadow: 0 0 0 0.2em var(--c), 0 0 0 0.6em color-mix(in srgb, var(--c) 20%, transparent), 0 0.15em 0.4em rgba(0, 0, 0, 0.3);
}
.hfx-range-slider-tooltip:hover .hfx-range-slider-tooltip-thumb::after {
opacity: 1;
transform: translate(-50%, 0) scale(1);
}
.hfx-range-slider-tooltip:hover .hfx-range-slider-tooltip-thumb::before {
opacity: 1;
transform: translate(-50%, 0);
}
@media (prefers-reduced-motion: reduce) {
.hfx-range-slider-tooltip, .hfx-range-slider-tooltip *, .hfx-range-slider-tooltip::before, .hfx-range-slider-tooltip::after, .hfx-range-slider-tooltip *::before, .hfx-range-slider-tooltip *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--hfx-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--hfx-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.