Origin Point — Return to Origin

Source Code

Copy the HTML, CSS or JavaScript you need for your project.

<button aria-label="ページ先頭の原点へ戻る" class="btt-control btt-2091 btt-hidden" data-btt="" type="button"><span class="origin-label">RETURN TO <b>ORIGIN</b></span><span aria-hidden="true" class="origin-axes"><i class="origin-y"></i><i class="origin-x"></i><i class="origin-point"></i></span><span class="origin-readout">Y <b data-state="">042</b><small>TOP = 000</small></span></button>

 .btt-control{box-sizing:border-box;appearance:none;cursor:pointer;user-select:none;-webkit-tap-highlight-color:transparent}.btt-control:focus-visible{outline:3px solid #e6a643;outline-offset:5px}.btt-hidden{opacity:0;visibility:hidden;pointer-events:none}.btt-visible{opacity:1;visibility:visible;pointer-events:auto} @media(prefers-reduced-motion:reduce){.btt-control,.btt-control *{animation-duration:.01ms!important;transition-duration:.01ms!important}}
 .btt-2091{position:fixed;right:clamp(15px,2vw,36px);top:50%;z-index:40;width:130px;height:252px;transform:translate(16px,-50%);opacity:0;border:1px solid #467281;background:#0d2230ee;color:#bce3ec;padding:12px 12px 14px;display:flex;flex-direction:column;align-items:start;text-align:left;box-shadow:0 15px 38px #0006;transition:opacity .3s,transform .3s,visibility .3s}.btt-2091.btt-visible{opacity:1;transform:translate(0,-50%)}.origin-label{font:700 10px/1.5 monospace;letter-spacing:.09em}.origin-label b{display:block;font:800 18px/1.2 Arial;letter-spacing:.09em;color:#eeffff}.origin-axes{width:100%;height:125px;margin:12px 0 9px;display:block;position:relative;background:linear-gradient(transparent 96%,#3c5866 0),linear-gradient(90deg,transparent 96%,#3c5866 0);background-size:20px 20px;border-left:1px solid #9fd4da;border-bottom:1px solid #9fd4da}.origin-y{position:absolute;left:0;top:0;bottom:0;width:1px;background:#82cad6}.origin-x{position:absolute;bottom:0;left:0;right:0;height:1px;background:#82cad6}.origin-point{position:absolute;left:calc(var(--progress,0)*80%);bottom:calc(var(--progress,0)*80%);width:13px;height:13px;border-radius:50%;background:#95e8d8;box-shadow:0 0 0 5px #9fe2cb28,0 0 0 0 #9fe2cb55;animation:originPulse 3s ease-out infinite}.origin-readout{font:800 11px/1.3 monospace;display:block}.origin-readout b{font-size:19px}.origin-readout small{display:block;margin-top:3px;font-size:9px;opacity:.8}.btt-2091:hover .origin-point{background:#fff;box-shadow:0 0 0 10px #9fe2cb20}.btt-2091.is-going .origin-point{transition:all .4s;left:0;bottom:0}@keyframes originPulse{0%,100%{box-shadow:0 0 0 4px #9fe2cb2d}50%{box-shadow:0 0 0 9px #9fe2cb10}}@media(max-width:650px){.btt-2091{top:auto;bottom:15px;right:12px;width:116px;height:197px;transform:translateY(15px);padding:10px}.btt-2091.btt-visible{transform:none}.origin-axes{height:87px;margin:7px 0}.origin-label b{font-size:16px}.origin-readout b{font-size:15px}}
/* Field QA / positioning and responsive readability */
@media(max-width:650px){.btt-2091{width:112px;height:157px;right:10px;bottom:14px;padding:8px}.origin-label{font-size:8px}.origin-label b{font-size:14px}.origin-axes{height:62px;margin:5px 0}.origin-readout{font-size:9px}.origin-readout b{font-size:13px}.origin-readout small{font-size:8px}}

(()=>{'use strict';const el=document.querySelector('[data-btt]');if(!el)return;const footerOnly=false;const reduce=window.matchMedia('(prefers-reduced-motion: reduce)');let raf=0;function update(){raf=0;const p=Math.max(0,Math.min(1,window.scrollY/Math.max(1,document.documentElement.scrollHeight-window.innerHeight)));if(!footerOnly){const shown=window.scrollY>170;el.classList.toggle('btt-visible',shown);el.classList.toggle('btt-hidden',!shown);el.tabIndex=shown?0:-1;el.setAttribute('aria-hidden',String(!shown));}el.style.setProperty('--progress',p.toFixed(3));const field=el.querySelector('[data-state]');if(field)field.textContent=String(Math.round(p*100)).padStart(3,'0');}function onScroll(){if(!raf)raf=requestAnimationFrame(update)}window.addEventListener('scroll',onScroll,{passive:true});window.addEventListener('resize',onScroll,{passive:true});el.addEventListener('click',()=>{el.classList.add('is-going');window.scrollTo({top:0,behavior:reduce.matches?'auto':'smooth'});window.setTimeout(()=>el.classList.remove('is-going'),650)});update()})();

How to Use

Insert the HTML button near the end of body, load the CSS, and include JavaScript using defer. Test scrolling, returning to the top, and positioning on mobile.

Use Case

Research, technology and data projects.

Technical Notes

Keep controls usable on touch devices. Test keyboard focus and reduced-motion preferences.

Mobile：Check tap target, visibility and positioning on small screens.

Browser：Designed for current Chrome, Edge, Firefox and Safari.

Reduced Motion：CSS animations respect the reduced-motion preference.