NoJsScrollBar/index.html at main · mobiwise-dev/NoJsScrollBar · GitHub

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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />

    <title>Scroll Progress Bar – Puce CSS (No JavaScript) | MobiWise.dev</title>

    <!-- Primary SEO -->
    <meta name="description" content="CSS-only scroll progress bar using scroll-driven animations, typed custom properties (CSS Houdini), and CSS counters. No JavaScript required." />
    <link rel="canonical" href="https://mobiwise-dev.github.io/NoJsScrollBar/" />

    <!-- Open Graph / Social preview -->
    <meta property="og:type" content="website" />
    <meta property="og:title" content="CSS-Only Scroll Progress Bar (No JavaScript)" />
    <meta property="og:description" content="Experimental CSS demo using scroll-driven animations and typed custom properties to build a scroll progress bar without JavaScript." />
    <meta property="og:url" content="https://mobiwise-dev.github.io/NoJsScrollBar/" />
    <meta property="og:site_name" content="MobiWise.dev" />

    <!-- Twitter -->
    <meta name="twitter:card" content="summary_large_image" />
    <meta name="twitter:title" content="CSS-Only Scroll Progress Bar" />
    <meta name="twitter:description" content="Scroll-driven animations + CSS Houdini = progress bar without JavaScript." />

    <!-- Favicon (minimal, optional but recommended) -->
    <link rel="icon" href="https://mobiwise.dev/MobiWise_Logo-Square.svg" />

    <style>
      @layer reset, base, components, utilities;

      @property --scroll {
        syntax: "<number>";
        inherits: false;
        initial-value: 0;
      }

      #progress-bar {
        position: fixed;
        inset: 0 0 auto 0;
        z-index: 1000;
        height: 0.33rem;
        background: linear-gradient(to right, blue calc(var(--scroll) * 1%), transparent 0);
      }

      #scroll-indicator {
        position: fixed;
        top: 2rem;
        right: 2rem;
        padding: 0.6rem 1rem;
        font-size: 1rem;
        color: white;
        border-radius: 1.4rem;
        background: rgba(0, 0, 0, 0.8);
        &::before {
          content: counter(scroll-value) "%";
          counter-reset: scroll-value calc(var(--scroll));
        }
      }

      #progress-bar,
      #scroll-indicator::before {
        animation: scroll-progress linear both;
        animation-timeline: scroll(root);
      }

      @layer utilities {
        @supports not (animation-timeline: scroll(root)) {
          body:before {
            content: "😬 Sorry Firefox users, this doesn't work for you.";
            font-size: 25px;
            min-height: 100dvh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
          }
          #progress-bar,
          #scroll-indicator {
            display: none;
          }
          section {
            display: none;
          }
        }
      }

      @keyframes scroll-progress {
        from {
          --scroll: 0;
        }
        to {
          --scroll: 100;
        }
      }

      @layer reset {
        * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }
      }

      @layer base {
        @property --bg-color {
          syntax: "<color>";
          inherits: false;
          initial-value: oklch(0.21 0.03 265);
        }
        @property --grid-color {
          syntax: "<color>";
          inherits: false;
          initial-value: oklch(1 0 0 / 0.05);
        }
        @property --color {
          syntax: "<color>";
          inherits: false;
          initial-value: oklch(0.87 0.12 81);
        }
        body {
          min-height: 100dvh;
          font-family: Arial, sans-serif;
          font-size: 1.5rem;
          color: oklch(from var(--bg-color) 0.8 c h);
          background-color: var(--bg-color);
          background-image:
            linear-gradient(var(--grid-color) 1px, transparent 1px), linear-gradient(90deg, var(--grid-color) 1px, transparent 1px), linear-gradient(var(--grid-color) 2px, transparent 2px),
            linear-gradient(90deg, var(--grid-color) 2px, transparent 2px);
          background-size:
            10px 10px,
            10px 10px,
            100px 100px,
            100px 100px;
        }

        h1 {
          font-size: 4rem;
          font-weight: 900;
          text-align: center;
          color: white;
          & span {
            font-size: clamp(2rem, 15vw, 8rem);
            color: var(--color);
            -webkit-text-stroke: 1px white;
            text-shadow: 0.25rem -0.25rem 0.375rem oklch(from var(--bg-color) l c h / 0.1);
            &:hover {
              text-decoration: line-through;
            }
          }
        }

        h2 {
          font-size: 3rem;
          text-align: center;
          color: white;
          margin-bottom: 1rem;
        }
        p {
          margin: 1rem 0;
        }
        b {
          color: white;
        }
        code {
          color: white;
          background-color: black;
        }
        main {
          max-width: 50rem;
          margin: 0 auto;
        }

        section {
          min-height: 100vh;
          padding: 2rem 1rem;
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
        }

        footer {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          p {
            display: inline-block;
            font-size: 0.8rem;
            text-align: center;
            a {
              color: inherit;
              text-decoration: none;
              &:hover {
                color: white;
              }
            }
          }
        }
      }

      @layer components {
        #logo {
          position: fixed;
          top: 2rem;
          left: 2rem;
          height: 6vh;
          aspect-ratio: 0.587;
          background-color: oklch(from var(--bg-color) 0.8 c h);
          clip-path: shape(
            from 97.41% 41.31%,
            arc by 2.59% 1.52% of 2.59% 1.52% small cw,
            vline by 55.65%,
            curve by -4.42% 1.08% with 0% 1.35%/-2.79% 2.03%,
            line to 0.76% 43.9%,
            curve to 2.6% 41.31% with -0.87% 42.95%/0.29% 41.31%,
            hline to 97.41%,
            close,
            move to 45.6% 74.32%,
            curve by 4.42% 1.08% with 1.63% -0.96%/4.42% -0.28%,
            vline to 87.59%,
            arc by -2.59% 1.52% of 2.59% 1.52% small cw,
            hline to 26.66%,
            curve by -1.83% -2.6% with -2.31% 0%/-3.47% -1.64%,
            line by 20.77% -12.19%,
            close,
            move to 90.02% 0.45%,
            curve by 4.42% 1.08% with 1.63% -0.96%/4.42% -0.28%,
            vline by 8.73%,
            arc by -0.76% 1.08% of 2.59% 1.52% small cw,
            line by -41.83% 24.55%,
            arc by -3.66% 0% of 2.59% 1.52% small cw,
            line by -41.83% -24.55%,
            arc to 5.6% 10.26% of -6.62% -4.97% small cw,
            vline to 1.52%,
            curve by 4.42% -1.08% with 0% -1.36%/2.79% -2.03%,
            line by 17.03% 10%,
            arc by 1.83% 0.45% of 2.59% 1.52% small ccw,
            hline by 42.28%,
            arc by 1.83% -0.45% of 2.59% 1.52% small ccw,
            line by 17.03% -10%,
            close,
            move to 13% 23.25%,
            curve by 4.42% -1.08% with 0% -1.35%/2.79% -2.03%,
            line by 13.36% 7.84%,
            curve by -1.83% 2.6% with 1.63% 0.96%/0.48% 2.6%,
            hline by -13.36%,
            arc by -2.59% -1.52% of 2.59% 1.52% small cw,
            vline by -7.84%,
            close,
            move to 82.62% 22.18%,
            curve by 4.42% 1.08% with 1.63% -0.96%/4.42% -0.28%,
            vline to 31.1%,
            arc by -2.59% 1.52% of 2.59% 1.52% small cw,
            hline by -13.37%,
            curve by -1.83% -2.6% with -2.31% 0%/-3.46% -1.64%,
            line by 13.37% -7.84%,
            close
          );
          transition: 0.3s;
          &:hover {
            transform: scale(1.1);
            background-color: oklch(1 0 0);
          }
        }

        #github {
          position: fixed;
          left: 2rem;
          bottom: 2rem;
          padding: 0.6rem;
          gap: 1rem;
          display: flex;
          flex-direction: row;
          align-items: center;
          justify-content: center;
          font-size: 1rem;
          color: oklch(1 0 0);
          text-decoration: none;
          border-radius: 2rem;
          background: oklch(0 0 0);
          transition: 0.3s;
          &:hover {
            transform: scale(1.1);
            background: oklch(0.2 0 0);
          }
          span {
            height: 1.5rem;
            width: 1.5rem;
            -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='black' d='M12 .297c-6.63 0-12 5.373-12 12c0 5.303 3.438 9.8 8.205 11.385c.6.113.82-.258.82-.577c0-.285-.01-1.04-.015-2.04c-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729c1.205.084 1.838 1.236 1.838 1.236c1.07 1.835 2.809 1.305 3.495.998c.108-.776.417-1.305.76-1.605c-2.665-.3-5.466-1.332-5.466-5.93c0-1.31.465-2.38 1.235-3.22c-.135-.303-.54-1.523.105-3.176c0 0 1.005-.322 3.3 1.23c.96-.267 1.98-.399 3-.405c1.02.006 2.04.138 3 .405c2.28-1.552 3.285-1.23 3.285-1.23c.645 1.653.24 2.873.12 3.176c.765.84 1.23 1.91 1.23 3.22c0 4.61-2.805 5.625-5.475 5.92c.42.36.81 1.096.81 2.22c0 1.606-.015 2.896-.015 3.286c0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
              no-repeat;
            mask-size: 100% 100%;
            background-color: oklch(1 0 0);
          }
        }

        #mouse {
          position: fixed;
          bottom: 5vh;
          right: 5vh;
          display: flex;
          align-items: center;
          justify-content: center;
          font-size: 0.7rem;
          .mouse-scroll {
            position: relative;
            width: 1.5rem;
            height: 2.5rem;
            border: 0.15rem solid white;
            border-radius: 2rem;
            &::before {
              content: "";
              position: absolute;
              left: 50%;
              transform: translateX(-50%);
              width: 0.4em;
              height: 0.4em;
              border-radius: 50%;
              background: white;
              animation: scroller 1.5s infinite;
            }
          }
          p {
            margin: 0 0.6rem;
            text-align: right;
          }
        }

        @keyframes scroller {
          0% {
            bottom: 80%;
            opacity: 1;
          }
          100% {
            bottom: 50%;
            opacity: 0;
          }
        }
      }
    </style>
  </head>
  <body>
    <div id="progress-bar"></div>
    <div id="scroll-indicator"></div>

    <div id="mouse">
      <p>Scroll down<br />to see<br />the magic</p>
      <div class="mouse-scroll"></div>
    </div>

    <a id="logo" href="https://mobiwise.dev" target="_blank" rel="author" title="visit mobiwise.dev" aria-label="link to mobiwise.dev" data-text="MobiWise.dev"></a>
    <a id="github" href="https://github.com/mobiwise-dev/NoJsScrollBar" target="_blank" title="more info on GitHUb" aria-label="link to GitHub" data-text="MobiWise.dev"><span></span> More info on GitHub</a>

    <main>
      <section>
        <h1>Scroll Progress Bar without <span data-depth="1.5rem" data-depth-layers="20" data-depth-event="pointer" data-depth-event-rotation="15deg">JavaScript</span></h1>
      </section>

      <section>
        <h2>Scroll Progress Bar - CSS only (with scroll-driven animations)</h2>
        <p>This demo shows how to build a scroll progress bar entirely in CSS, using scroll-driven animations <code>animation-timeline: scroll()</code>, custom properties, and no JavaScript for the progress itself.</p>
        <p>The progress bar at the top of the page is driven by a CSS custom property <code>--scroll</code> that animates from <code>0</code> to <code>100</code> as the document scrolls.</p>
        <p>This value is then reused to dynamically update the bar’s gradient; all handled by the browser’s animation engine.</p>
      </section>

      <section>
        <h2>What’s CSS-only here</h2>
        <ul>
          <li>Scroll position tracking via <code>animation-timeline: scroll(root)</code></li>
          <li>Progress calculation using a typed custom property <code>@property</code></li>
          <li>Smooth, performant updates handled natively by CSS</li>
          <li>No JavaScript involved in computing or animating the progress bar</li>
        </ul>
      </section>

      <section>
        <h2>About the percentage counter</h2>

        <p>Displaying a live numeric value in pure CSS has long been considered difficult, especially when the value is driven by animations.</p>

        <p>
          This demo uses a modern CSS approach combining typed custom properties
          <code>@property</code> and CSS counters to display the scroll percentage without JavaScript.
        </p>

        <ul>
          <li>The scroll position animates a numeric CSS variable <code>--scroll</code></li>
          <li>The variable is typed and interpolated using CSS Houdini</li>
          <li>A CSS counter converts the numeric value into readable text</li>
          <li>The displayed value is an integer approximation (0–100)</li>
        </ul>

        <p>This technique relies on very recent CSS features and is currently supported only in modern Chromium-based browsers and Safari.</p>

        <p>
          <b> In production environments, JavaScript is still the most robust solution for dynamic numeric text — but this demo shows what modern CSS can already do. </b>
        </p>
      </section>

      <section>
        <h2>Takeaway</h2>
        <ul>
          <li>Modern CSS can track scroll position without JavaScript</li>
          <li>Typed custom properties enable real numeric interpolation</li>
          <li>CSS counters can expose animated values as readable text</li>
          <li>JavaScript remains the best choice for full cross-browser support</li>
        </ul>
        <p>This pen explores the current frontier of what CSS can do today, without polyfills, hacks, or misleading shortcuts.</p>
      </section>

      <footer>
        <p>
          © 2026
          <a class="link" href="https://mobiwise.dev" target="_blank" rel="author" title="visit mobiwise.dev" aria-label="link to mobiwise.dev" data-text="MobiWise.dev">MobiWise.dev</a>
        </p>
      </footer>
    </main>

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