Step Slider Radio Buttons
A range slider with fixed stops, made of radios: a thumb springs to the chosen notch while the fill stretches behind it. Here it picks a playback speed; notches are one radio each.
Also known as: range slider radio buttons, css step slider, discrete slider css.
HTML
<div class="rad-step-slider" role="radiogroup" aria-label="Playback speed"> <span class="rad-step-slider-track" aria-hidden="true"><span class="rad-step-slider-fill"></span></span> <span class="rad-step-slider-thumb" aria-hidden="true"></span> <label><input type="radio" name="rad-step-slider" value="0.5"><span>0.5x</span></label> <label><input type="radio" name="rad-step-slider" value="0.75"><span>0.75x</span></label> <label><input type="radio" name="rad-step-slider" value="1" checked><span>1x</span></label> <label><input type="radio" name="rad-step-slider" value="1.5"><span>1.5x</span></label> <label><input type="radio" name="rad-step-slider" value="2"><span>2x</span></label> </div>
CSS
.rad-step-slider {
--c: var(--rad-color, #3b82f6);
font-size: var(--rad-size, 18px);
--i: 0;
position: relative;
display: grid;
grid-template-columns: repeat(5, 3.4em);
font-family: system-ui, sans-serif;
line-height: 1.2;
}
.rad-step-slider:has(label:nth-of-type(2) :checked) { --i: 1; }
.rad-step-slider:has(label:nth-of-type(3) :checked) { --i: 2; }
.rad-step-slider:has(label:nth-of-type(4) :checked) { --i: 3; }
.rad-step-slider:has(label:nth-of-type(5) :checked) { --i: 4; }
.rad-step-slider-track {
position: absolute;
top: 0.75em;
left: 1.7em;
right: 1.7em;
height: 0.3em;
border-radius: 0.3em;
background: color-mix(in srgb, currentColor 14%, transparent);
}
.rad-step-slider-fill {
position: absolute;
inset: 0;
border-radius: inherit;
background: var(--c);
transform: scaleX(calc(var(--i) / 4));
transform-origin: left;
transition: transform 0.45s cubic-bezier(0.34, 1.2, 0.64, 1);
}
.rad-step-slider-thumb {
position: absolute;
z-index: 2;
top: 0.9em;
left: 1.7em;
box-sizing: border-box;
width: 1.35em;
height: 1.35em;
margin: -0.675em 0 0 -0.675em;
border: 0.22em solid var(--c);
border-radius: 50%;
background: #fff;
box-shadow: 0 0.15em 0.4em rgba(0, 0, 0, 0.25);
translate: calc(var(--i) * 3.4em) 0;
transition: translate 0.45s cubic-bezier(0.34, 1.2, 0.64, 1), box-shadow 0.2s ease;
pointer-events: none;
}
.rad-step-slider:has(:focus-visible) .rad-step-slider-thumb {
box-shadow: 0 0 0 0.3em color-mix(in srgb, var(--c) 30%, transparent), 0 0.15em 0.4em rgba(0, 0, 0, 0.25);
}
.rad-step-slider label {
position: relative;
display: grid;
justify-items: center;
padding-top: 2.1em;
cursor: pointer;
}
.rad-step-slider label::before {
content: "";
position: absolute;
top: 0.9em;
left: 50%;
width: 0.42em;
height: 0.42em;
margin: -0.21em 0 0 -0.21em;
border-radius: 50%;
background: color-mix(in srgb, currentColor 35%, transparent);
transition: background-color 0.3s ease, transform 0.3s ease;
}
.rad-step-slider label:has(~ label :checked)::before {
background: rgba(255, 255, 255, 0.9);
transform: scale(0.45);
}
.rad-step-slider input {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
margin: 0;
opacity: 0;
cursor: pointer;
z-index: 1;
}
.rad-step-slider input + span {
font-size: 0.8em;
font-weight: 600;
font-variant-numeric: tabular-nums;
color: color-mix(in srgb, currentColor 55%, transparent);
transition: color 0.25s ease;
}
.rad-step-slider label:hover input + span {
color: currentColor;
}
.rad-step-slider input:checked + span {
color: var(--c);
}
.rad-step-slider input:focus-visible + span {
outline: 0.12em solid var(--c);
outline-offset: 0.15em;
border-radius: 0.2em;
}
@media (prefers-reduced-motion: reduce) {
.rad-step-slider, .rad-step-slider *, .rad-step-slider::before, .rad-step-slider::after, .rad-step-slider *::before, .rad-step-slider *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--rad-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--rad-size. Every other dimension is inem, so the whole thing scales together. Currently previewing18px. - 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.