JD.com app product details page at the top of the tab switch, the following red caterpillar effect is how to achieve?

JD.com app product details page at the top of the tab switch, how is the following red caterpillar effect achieved?

Css3 Animation
Mar.04,2022 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Tab Line Index</title>
    <style type="text/css">
    .clear-fix:after {content:'\200B';clear:both;height:0;visibility:hidden;display:block;}

    .tab-list {position:relative;font-size:24px;border:1px solid -sharpCCC;}
    .tab-list .tab {float:left;padding:0.25em 1em;}
    .tab-list .line {position:absolute;height:3px;background-color:-sharpF00;}
    /** /
    .tab-list .line-next {transition: left ease-out 0.2s, right ease-in 0.2s;}
    .tab-list .line-prev {transition: left ease-in 0.2s, right ease-out 0.2s;}
    /**/
    /**/
    .tab-list .line-next {transition: left cubic-bezier(0,1,1,1) 0.2s, right cubic-bezier(1,0,1,1) 0.2s;}
    .tab-list .line-prev {transition: left cubic-bezier(1,0,1,1) 0.2s, right cubic-bezier(0,1,1,1) 0.2s;}
    /**/
    </style>
    <script>
    document.addEventListener('DOMContentLoaded', function(){

        let rectTabList, rect;

        let lineBaseX, lineBaseY;

        let domTabList = document.querySelector('.tab-list');
        let domLine    = domTabList.querySelector('.line');

        rectTabList = domTabList.getBoundingClientRect();
        rect        = domLine.getBoundingClientRect();
        lineBaseX   = rect.x;
        lineBaseY   = rect.y;

        let arrDomTab = domTabList.querySelectorAll('.tab');
        let i, domTab;
        let lineY = 0;
        for(i=0; i<arrDomTab.length; iPP)
        {
            domTab = arrDomTab[i];
            rect   = domTab.getBoundingClientRect();

            domTab.setAttribute('data-xl', Math.floor(rect.x - rectTabList.x));
            domTab.setAttribute('data-xr', Math.floor(rectTabList.x + rectTabList.width - rect.x - rect.width));

            lineY = Math.max(lineY, rect.bottom);
        }

        domLine.style.top = Math.floor(lineY - lineBaseY)+'px';

        domTabList.addEventListener('click', function($evt){
            let dom = $evt.target;
            if(dom.classList.contains('tab') === false)
                return;

            let xl = parseInt(dom.getAttribute('data-xl'), 10);
            let xr = parseInt(dom.getAttribute('data-xr'), 10);

            rect = domLine.getBoundingClientRect();
            if(xl > rect.x)
            {
                // next
                domLine.className = 'line line-next';
                setTimeout(function(){
                    domLine.style.left = xl+'px';
                    domLine.style.right = xr+'px';
                }, 1);
            }
            else
            {
                // prev
                domLine.className = 'line line-prev';
                setTimeout(function(){
                    domLine.style.left = xl+'px';
                    domLine.style.right = xr+'px';
                }, 1);
            }

        });
    });
    </script>
</head>
<body>
<div class="tab-list clear-fix">
    <div class="tab">Tab</div>
    <div class="tab"></div>
    <div class="tab">Label</div>
    <div class="line"></div>
</div>
</body>
</html>

excessive left right

Previous: Command Walk Agent, http_proxy and https_proxy setup issu

Next: The page is the simplest website made of html css js folder. Can you use vue for a single page?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b38a6b-2c139.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38a6b-2c139.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?