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HTML
<snap-tabs>
<header class="scroll-snap-x">
<nav>
<a active href="#responsive">Responsive</a>
<a href="#accessible">Accessible</a>
<a href="#overscroll">Horizontal Overscroll Ready</a>
<a href="#more"><!-- ...SVG icon --></a>
</nav>
<span class="snap-indicator"></span>
</header>
<section class="scroll-snap-x">
<article id="responsive">
<!-- ...content -->
</article>
<article id="accessible">
<!-- ...content -->
</article>
<article id="overscroll">
<!-- ...content -->
</article>
<article id="more">
<!-- ...content -->
</article>
</section>
</snap-tabs>
CSS
snap-tabs {
--hue: 328deg;
--accent: var(--hue) 100% 54%;
--indicator-size: 2px;
--space-1: .5rem;
--space-2: 1rem;
--space-3: 1.5rem;
display: flex;
flex-direction: column;
overflow: hidden;
position: relative;
& :matches(header, nav, section, article, a) {
outline-color: hsl(var(--accent));
outline-offset: -5px;
}
}
.scroll-snap-x {
overflow: auto hidden;
overscroll-behavior-x: contain;
scroll-snap-type: x mandatory;
@media (prefers-reduced-motion: no-preference) {
scroll-behavior: smooth;
}
@media (hover: none) {
scrollbar-width: none;
&::-webkit-scrollbar {
width: 0;
height: 0;
}
}
}
snap-tabs > header {
--text-color: hsl(var(--hue) 5% 40%);
--text-active-color: hsl(var(--hue) 20% 10%);
flex-shrink: 0;
min-block-size: fit-content;
display: flex;
flex-direction: column;
& > nav {
display: flex;
}
& a {
scroll-snap-align: start;
display: inline-flex;
align-items: center;
white-space: nowrap;
font-size: .8rem;
color: var(--text-color);
font-weight: bold;
text-decoration: none;
padding: var(--space-2) var(--space-3);
& > svg {
inline-size: 1.5em;
pointer-events: none;
}
&:hover {
background: hsl(var(--accent) / 5%);
}
&:focus {
outline-offset: -.5ch;
}
}
& > .snap-indicator {
inline-size: 0;
block-size: var(--indicator-size);
border-radius: var(--indicator-size);
background: hsl(var(--accent));
}
}
snap-tabs > section {
block-size: 100%;
display: grid;
grid-auto-flow: column;
grid-auto-columns: 100%;
& > article {
scroll-snap-align: start;
overflow-y: auto;
overscroll-behavior-y: contain;
padding: var(--space-2) var(--space-3);
}
}
@media (prefers-reduced-motion: reduce) {
/*
- swap to border-bottom styles
- transition colors
- hide the animated .indicator
*/
snap-tabs {
& > header a {
border-block-end: var(--indicator-size) solid hsl(var(--accent) / 0%);
transition:
color .7s ease,
border-color .5s ease;
&:matches(:target,:active,[active]) {
color: var(--text-active-color);
border-block-end-color: hsl(var(--accent));
}
}
& .snap-indicator {
visibility: hidden;
}
}
}
JS
import 'https://argyleink.github.io/scroll-timeline/dist/scroll-timeline.js'
const {matches:motionOK} = window.matchMedia(
'(prefers-reduced-motion: no-preference)'
)
// grab and stash elements
const tabgroup = document.querySelector('snap-tabs')
const tabsection = tabgroup.querySelector(':scope > section')
const tabnav = tabgroup.querySelector(':scope nav')
const tabnavitems = tabnav.querySelectorAll(':scope a')
const tabindicator = tabgroup.querySelector(':scope .snap-indicator')
/*
shared timeline for .indicator
and nav > a colors */
const sectionScrollTimeline = new ScrollTimeline({
scrollSource: tabsection,
orientation: 'inline',
fill: 'both',
})
/*
for each nav link
- animate color based on the scroll timeline
- color is active when it's the current index*/
tabnavitems.forEach(navitem => {
navitem.animate({
color: [...tabnavitems].map(item =>
item === navitem
? `var(--text-active-color)`
: `var(--text-color)`)
}, {
duration: 1000,
fill: 'both',
timeline: sectionScrollTimeline,
}
)
})
if (motionOK) {
tabindicator.animate({
transform: [...tabnavitems].map(({offsetLeft}) =>
`translateX(${offsetLeft}px)`),
width: [...tabnavitems].map(({offsetWidth}) =>
`${offsetWidth}px`)
}, {
duration: 1000,
fill: 'both',
timeline: sectionScrollTimeline,
}
)
}
const setActiveTab = tabbtn => {
tabnav
.querySelector(':scope a[active]')
.removeAttribute('active')
tabbtn.setAttribute('active', '')
tabbtn.scrollIntoView()
}
const determineActiveTabSection = () => {
const i = tabsection.scrollLeft / tabsection.clientWidth
const matchingNavItem = tabnavitems[i]
matchingNavItem && setActiveTab(matchingNavItem)
}
tabnav.addEventListener('click', e => {
if (e.target.nodeName !== "A") return
setActiveTab(e.target)
})
tabsection.addEventListener('scroll', () => {
clearTimeout(tabsection.scrollEndTimer)
tabsection.scrollEndTimer = setTimeout(
determineActiveTabSection
, 100)
})
window.onload = () => {
if (location.hash)
tabsection.scrollLeft = document
.querySelector(location.hash)
.offsetLeft
determineActiveTabSection()
}
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2023-07-05 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2023-07-05 UTC."],[],[]]