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About the <head>

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CSS

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CSS Base

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HTML 

              
                    <section class="content-tabs">
      <nav role="tablist">
        <a
          href="#tab-1"
          aria-selected="true"
          aria-controls="tabpanel-1"
          id="tab-1"
          role="tab"
          >Lorem ipsum</a
        >
        <a
          href="#tab-2"
          aria-selected="false"
          aria-controls="tabpanel-2"
          id="tab-2"
          role="tab"
          >Sed ut perspiciatis</a
        >
        <a
          href="#tab-3"
          aria-selected="false"
          aria-controls="tabpanel-3"
          id="tab-3"
          role="tab"
          >At vero eos et accusamus</a
        >
        <a
          href="#tab-4"
          aria-selected="false"
          aria-controls="tabpanel-4"
          id="tabpanel-4"
          role="tab"
          >Eu mel impedit</a
        >
        <a
          href="#tab-5"
          aria-selected="false"
          aria-controls="tabpanel-5"
          id="tab-5"
          role="tab"
          >Noster deseruisse</a
        >
        <a
          href="#tab-6"
          aria-selected="false"
          aria-controls="tabpanel-6"
          id="tab-6"
          role="tab"
          >Erat concludaturque eam</a
        >
        <a
          href="#tab-7"
          aria-selected="false"
          aria-controls="tabpanel-7"
          id="tab-7"
          role="tab"
          >Ut dolorem reprimique est</a
        >
        <a
          href="#tab-8"
          aria-selected="false"
          aria-controls="tabpanel-8"
          id="tab-8"
          role="tab"
          >Falli persequeris</a
        >
      </nav>
      <section aria-live="polite" role="region">
        <article id="tabpanel-1" role="tabpanel">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
          eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
          minim veniam, quis nostrud exercitation ullamco laboris nisi ut
          aliquip ex ea commodo consequat. Duis aute irure dolor in
          reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
          pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
          culpa qui officia deserunt mollit anim id est laborum.
          <br />
        </article>
        <article id="tabpanel-2" role="tabpanel" hidden>
          Sed ut perspiciatis unde omnis iste natus error sit voluptatem
          accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae
          ab illo inventore veritatis et quasi architecto beatae vitae dicta
          sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit
          aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos
          qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui
          dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed
          quia non numquam eius modi tempora incidunt ut labore et dolore magnam
          aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum
          exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex
          ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in
          ea voluptate velit esse quam nihil molestiae consequatur, vel illum
          qui dolorem eum fugiat quo voluptas nulla pariatur?
        </article>
        <article id="tabpanel-3" role="tabpanel" hidden>
          At vero eos et accusamus et iusto odio dignissimos ducimus qui
          blanditiis praesentium voluptatum deleniti atque corrupti quos dolores
          et quas molestias excepturi sint occaecati cupiditate non provident,
          similique sunt in culpa qui officia deserunt mollitia animi, id est
          laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita
          distinctio. Nam libero tempore, cum soluta nobis est eligendi optio
          cumque nihil impedit quo minus id quod maxime placeat facere possimus,
          omnis voluptas assumenda est, omnis dolor repellendus. Temporibus
          autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe
          eveniet ut et voluptates repudiandae sint et molestiae non recusandae.
          Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis
          voluptatibus maiores alias consequatur aut perferendis doloribus
          asperiores repellat.
        </article>
        <article id="tabpanel-4" role="tabpanel" hidden>
          Eu mel impedit adversarium liberavisse. At viris dignissim inciderint
          vix, in quo altera scripserit. Eu nusquam evertitur mei, at sed posse
          graeci eleifend. No suas salutatus quo, no vix vitae possim detraxit.
          Causae consulatu eum cu.
        </article>
        <article id="tabpanel-5" role="tabpanel" hidden>
          Noster deseruisse ei est, ad sed reque abhorreant. Ad meis ferri cum,
          in quando placEu mel impedit adversarium liberavisse. At viris
          dignissim inciderint vix, in quo altera scripserit. Eu nusquam
          evertitur mei, at sed posse graeci eleifend. No suas salutatus quo, no
          vix vitae possim detraxit. Causae consulatu eum cu.
        </article>
        <article id="tabpanel-6" role="tabpanel" hidden>
          erat concludaturque eam, ubique eirmod has ex. At sea quas erroribus,
          cu mea prodesset tincidunt. Probo inani no has, id eum vero
          reprimique. Te etiam aliquid vis, scripta delenit vix at, utroque
          tacimates mnesarchum ad pro. An minimum accusata nec, novum ceteros
          adversarium sed ne, id vim elit aeterno. Sed option bonorum maluisset
          at, te duo hinc clita admodum, perpetua periculis voluptatibus an mel.
        </article>
        <article id="tabpanel-7" role="tabpanel" hidden>
          Ut dolorem reprimique est. An ius blandit dignissim consectetuer. Ea
          sit consulatu persecuti, duo eu quis fabulas. Sale utinam pro ex, sed
          ne sale soleat tacimates, quo id sale habemus electram. Qui ad integre
          iudicabit.
        </article>
        <article id="tabpanel-8" role="tabpanel" hidden>
          Falli persequeris accommodare an per, te habeo doctus delectus quo.
          Autem iisque accumsan sea eu. Ei mazim nobis omnes est, quaestio
          maiestatis elaboraret ad his. Vel latine utroque oporteat eu.
        </article>
      </section>
    </section>
!

CSS 

              
                      body {
        background-color: #eee;
      }

      .content-tabs {
        box-sizing: border-box;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        background-color: #fff;
        overflow: hidden;
        padding: 10px 25px;
      }
      .content-tabs *,
      .content-tabs *:before,
      .content-tabs *:after {
        box-sizing: border-box;
      }

      .content-tabs [role="tablist"] {
        display: flex;
        flex-wrap: nowrap;
        flex: 1 1 100%;
        padding: 0;
        position: relative;
        overflow-x: auto;
        background-image: 
	
        --indicator-width: 0;
        --indicator-left: 0;          
          
            /* Shadows */ linear-gradient(
            to right,
            white,
            white
          ),
          linear-gradient(to right, white, white),
          /* Shadow covers */
            linear-gradient(
              to right,
              rgba(80, 80, 80, 0.2),
              rgba(255, 255, 255, 0)
            ),
          linear-gradient(
            to left,
            rgba(80, 80, 80, 0.2),
            rgba(255, 255, 255, 0)
          );

        background-position: left center, right center, left center,
          right center;
        background-repeat: no-repeat;
        background-color: white;
        background-size: 20px 100%, 20px 100%, 10px 100%, 10px 100%;

        /* Opera doesn't support this in the shorthand */
        background-attachment: local, local, scroll, scroll;
      }

     .content-tabs [role="tablist"]::-webkit-scrollbar {
       display: none;
     }

      .content-tabs [role="tablist"] [role="tab"] {
        padding: 20px 0;
        margin: 0 20px;
        border: none;
        text-decoration: none;
        display: block;
        white-space: nowrap;
        user-select: none;
        font-family: sans-serif;
        color: #000;
      }

      .content-tabs [role="tablist"] [role="tab"][aria-selected="true"] {
        font-weight: bold;
      }

      .content-tabs [role="tablist"] [role="tab"]:first-of-type {
        margin-left: 0;
      }

      .content-tabs [role="tablist"] [role="tab"]:last-of-type {
        margin-right: 0;
      }

      .content-tabs [role="tablist"]:after {
        display: inline-block;
        position: absolute;
        height: 2px;
        min-width: var(--indicator-width);
        max-width: var(--indicator-width);
        bottom: 0;
        left: var(--indicator-left);
        background-color: red;
        content: "";
        transition: left 0.8s ease-in-out, min-width 0.8s ease-in-out,
          max-width 0.8s ease-in-out;
      }

      .content-tabs [role="region"] {
        display: flex;
        flex-direction: column;
        flex: 1 1 100%;
      }

      .content-tabs [role="tabpanel"] {
        width: 100%;
        overflow: auto;
        min-height: 200px;
        opacity: 1;
        transform: translateX(0);
        transition: opacity 0.5s linear, transform 0.4s ease-out;
        will-change: opacity, transform;
        overflow: auto;
        padding: 20px 0;
      }

      .content-tabs [role="tabpanel"].slided-right,
      .content-tabs [role="tabpanel"].slided-left {
        opacity: 0;
        pointer-events: none;
      }

      .content-tabs [role="tabpanel"].slided-left {
        transform: translateX(-100%);
      }

      .content-tabs [role="tabpanel"].slided-right {
        transform: translateX(100%);
      }
!

JS 

              
                      /*******************************************************************************/

      const _delegate = function (e, t, n, o, r) {
        let c;
        c = e
          ? "string" == typeof e || e instanceof String
            ? document.querySelector(e)
            : e
          : document.querySelector("body");
        let l = t.split(",");
        for (var i = 0, s = l.length; i < s; i++)
          c.addEventListener(
            l[i],
            function (e) {
              e.target.matches(n) && o(e);
            },
            r || "scroll" == l[i]
          );
      };

      /*******************************************************************************/

      const _beginMomentumTracking = (scroller) => {
        _cancelMomentumTracking(scroller);
        scroller.scrollingStatus.momentumID = requestAnimationFrame(
          function () {
            _momentumLoop(scroller);
          }
        );
      };

      /*******************************************************************************/

      const _cancelMomentumTracking = (scroller) => {
        cancelAnimationFrame(scroller.scrollingStatus.momentumID);
      };

      /*******************************************************************************/

      const _momentumLoop = (scroller) => {
        scroller.element.scrollLeft += scroller.scrollingStatus.velX;
        scroller.scrollingStatus.velX *= 0.95;
        if (Math.abs(scroller.scrollingStatus.velX) > 0.5) {
          scroller.scrollingStatus.momentumID = requestAnimationFrame(
            function () {
              _momentumLoop(scroller);
            }
          );
        }
      };

      /******************************************************************************/

      const _setIndicator = function (tabList,tab) {
        tabList.style.setProperty(
          "--indicator-width",
          tab.offsetWidth + "px"
        );
        tabList.style.setProperty(
          "--indicator-left",
          tab.offsetLeft + "px"
        );
      };

      /******************************************************************************/

      document.querySelectorAll(".content-tabs").forEach((tabs) => {
        const panelsContainer = tabs.querySelector('[role="region"]'),
          tabList = tabs.querySelector('[role="tablist"]'),
          scroller = {
            element: tabList,
            scrollingStatus: {
              isDown: false,
              startX: null,
              scrollLeft: null,
              velX: 0,
              momentumID: null,
            },
          };

        /*---------------------------------------------------------------------------*/

        tabList.addEventListener("mousedown", function (e) {
          scroller.scrollingStatus.isDown = true;
          scroller.element.classList.add("scrolling");
          scroller.scrollingStatus.startX =
            e.pageX - scroller.element.offsetLeft;
          scroller.scrollingStatus.scrollLeft = scroller.element.scrollLeft;
          _cancelMomentumTracking(scroller);
        });

        /*---------------------------------------------------------------------------*/

        tabList.addEventListener("mouseup", () => {
          scroller.scrollingStatus.isDown = false;
          scroller.element.classList.remove("scrolling");
          _beginMomentumTracking(scroller);
        });

        /*---------------------------------------------------------------------------*/

        tabList.addEventListener("mousemove", (e) => {
          if (!scroller.scrollingStatus.isDown) return;
          e.preventDefault();
          const x = e.pageX - scroller.element.offsetLeft;
          const walk = (x - scroller.scrollingStatus.startX) * 3; //scroll-fast
          var prevScrollLeft = scroller.element.scrollLeft;
          scroller.element.scrollLeft =
            scroller.scrollingStatus.scrollLeft - walk;
          scroller.scrollingStatus.velX =
            scroller.element.scrollLeft - prevScrollLeft;
        });

        /*---------------------------------------------------------------------------*/

        tabList.addEventListener(
          "wheel",
          (e) => {
            _cancelMomentumTracking(scroller);
          },
          { passive: true }
        );

        /*---------------------------------------------------------------------------*/

        _delegate(tabs, "click", '[role="tab"][aria-controls]', (event) => {
          const tab = event.target;

          if (tab.getAttribute("aria-selected") == "true") return false;
          
if (Math.abs(scroller.scrollingStatus.startX - (event.pageX - scroller.element.offsetLeft)) > 0) return false; //prevent false clicks during dragging            

          const tabPanelIn = panelsContainer.querySelector(
              "#" + tab.getAttribute("aria-controls")
            ),
            tabOut = tabs.querySelector('[aria-selected="true"]'),
            tabPanelOut = panelsContainer.querySelector(
              "#" + tabOut.getAttribute("aria-controls")
            ),
            indexIn = [...panelsContainer.children].indexOf(tabPanelIn), //index of element relative to container
            indexOut = [...panelsContainer.children].indexOf(tabPanelOut),
            directionOut = indexIn > indexOut ? "left" : "right",
            directionIn = directionOut == "right" ? "left" : "right";

          tab.setAttribute("aria-selected", true);
          tabOut.setAttribute("aria-selected", false);

          _setIndicator(tabList,tab); //set after  appliyng aria-selected styles fo correct width & position

          tabPanelIn.classList.remove("slided-left", "slided-right");
          tabPanelIn.classList.add("slided-" + directionIn);

          tabPanelOut.addEventListener(
            "transitionend",
            () => {
              tabPanelOut.setAttribute("hidden", true);
              tabPanelOut.classList.remove("slided-" + directionOut);
              tabPanelIn.removeAttribute("hidden");
              tab.scrollIntoView({
                behavior: "smooth",
                block: "start",
                inline: "nearest",
              });

              setTimeout(() => {
                tabPanelIn.classList.remove("slided-" + directionIn);
              }, 1);
            },
            { once: true }
          );

          tabPanelOut.classList.add("slided-" + directionOut);

          tabs.dispatchEvent(
            new CustomEvent("content-tabs:selected", {
              detail: {
                tabId: tab.getAttribute("aria-controls"),
                tab: tab,
                tabs: tabs,
              },
            })
          );
        });

        /*---------------------------------------------------------------------------*/

        _setIndicator(tabList, tabs.querySelector('[role="tab"]')); //first one set on initialization

        tabs.dispatchEvent(
          new CustomEvent("content-tabs:initialized", {
            detail: { tabs: tabs },
          })
        );
      });
!
999px

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