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Scroll Driven Patterns

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These patterns use the CSS scroll-driven API available from june 2023 in Chrome to create effects that are triggered by the user scrolling the page using only CSS.

Progress

The Progress element is a simple progress bar that fills as the user scrolls down the page. It is useful for showing the user how far they have scrolled through a page.

an animation shows a horizontal bar growing from left to right as the page scrolls down.

Demo of the Progress structure, tweaked with highly exagerated bar height to make it obvious

It renders the following html on front-end:

rendered html
<div id="progress"></div>

The dummy text which is inserted is there only for the purpose of having a long enough page to scroll and can be safely deleted.

The element has custom CSS which can be tweaked to style it.

custom CSS
html {
  scroll-timeline: --page-scroll block;
}


@keyframes scroll-progress {
  0% {
    transform: scaleX(0);
  }
  100% {
    transform: scaleX(1);
  }
}


%root% {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 5px;
  min-height: initial;
  background: var(--_sez-accent-color);
  z-index: 100000;


  transform-origin: 0 50%;
  animation: scroll-progress auto linear;
  animation-timeline: --page-scroll;
}

To customize the element while keeping fuctionnality, I recommend changing only the following properties:

  • height
  • background
  • z-index

And if necessary to change its position:

  • left
  • top
  • width

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A central column scrolls with the page, while the left and right columns scroll in the opposite direction. This creates a parallax effect that can be used to display images or other content.

an animation shows a horizontal bar growing from left to right as the page scrolls down.

Demo of the Progress structure, tweaked with highly exagerated bar height to make it obvious

It renders the following html on front-end:

rendered html
<section class="sez-section">
  <div class="sez-section__body sez-section__body--fancy-gallery">
    <div
      class="sez-section__column sez-section__column--fancy-gallery sez-section__column--reverse"
    >
      <img
        class="sez-image--fancy-gallery"
        src="//picsum.photos/seed/structeezy-kxlppt/640"
        alt=""
      />
      <!-- 10 random images -->
    </div>
    <div class="sez-section__column sez-section__column--fancy-gallery">
      <img
        class="sez-image--fancy-gallery"
        src="//picsum.photos/seed/structeezy-kvbopc/640"
        alt=""
      />
      <!-- 10 random images -->
    </div>
    <div
      class="sez-section__column sez-section__column--fancy-gallery sez-section__column--reverse"
    >
      <img
        class="sez-image--fancy-gallery"
        src="//picsum.photos/seed/structeezy-kmncsq/640"
        alt=""
      />
      <!-- 10 random images -->
    </div>
  </div>
</section>

The functionality comes from the following class:

custom CSS
.sez-section__column--reverse {
  transform: translateY(calc(-100% + 100vh));
  flex-direction: column-reverse;
  animation: adjust-position linear forwards;
  animation-timeline: scroll(root block);
}


@keyframes adjust-position {
  from {
    transform: translateY(calc(-100% + 100vh));
  }
  to {
    transform: translateY(calc(100% - 100vh));
  }
}

Hero2header

A full screen hero section that transitions into a header as the user scrolls down the page.

a full screen hero section with a big centered heading shrinks to a top header as the page is scrolled down
Demo of the Hero2header structure

It renders the following html on front-end:

rendered html
<header id="hero-to-header">
  <h1>I am a h1 heading</h1>
</header>

The dummy text which is inserted is there only for the purpose of having a long enough page to scroll and can be safely deleted.

The element has custom CSS which can be tweaked to style it.

custom CSS
html {
  scroll-timeline: --page-scroll block;
}


body{
  padding-block-start: 100vb;
}


@keyframes hero-to-header-move-and-size {
  from {
    background-position: 50% 0;
    block-size: 100vb;
    font-size: calc(10vi + 1em);
  }
  to {
    background-position: 50% 100%;
    background-color: var(--_sez-accent-color);
    block-size: 10vb;
    font-size: 2em;
  }
}


%root% {
  color: white;
  block-size: 100vb;
  inline-size: 100%;
  background-image: url(https://picsum.photos/seed/structeezy-He4f7S/1920/1080);
  background-size: cover;
  background-position: 50% 50%;
  background-blend-mode: soft-light;
  display: grid;
  place-items: center;
  text-align: center;
}


@supports (animation-range: 0vh 90vh){
  %root% {
    position: fixed;
    inset-block-start: 0;


    animation: hero-to-header-move-and-size linear forwards;
    animation-range: 0vb 90vb;
    animation-timeline: --page-scroll;
  }
}

To customize the element while keeping fuctionnality, I recommend changing only the following properties:

  • color: the default text color in the element.
  • background-image: the image used as background. You can also use a gradient.
  • background-blend-mode: the blend mode used for the background image and the overlay color defined in the animation.

And in the animation @keyframes:

  • font-size from and to: font sizes. You will need to adjust to match your design.
  • background-color to: defines the overlay color when the hero shrinks to a header
  • block-size to: the size of the header when shrinked.

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ImageReveal

This structure includes images with a custom CSS class that reveals images with a growing circle mask effect when entering the viewport as the page scrolls down.

an animation shows images fading in with a growing circle mask effect when entering the viewport as the page scrolls down.
Demo of the ImageReveal structure

It renders the following html on front-end:

rendered html
<img
  class="sez-reveal-image"
  src="//picsum.photos/seed/structeezy-qdimzn/640/480"
  alt=""
/>

The dummy text which is also inserted is there only for the purpose of having a long enough page to scroll and can be safely deleted.

The element includes a custom CSS class sez-reveal-image which can be tweaked to style it.

custom CSS
%root% {
  view-timeline-name: --revealing-image;
  view-timeline-axis: block;
  animation: linear sez-reveal-image both;
  animation-timeline: --revealing-image;
  animation-range: entry 25% cover 50%;
}


@keyframes sez-reveal-image {
  from {
    opacity: 0;
    clip-path: circle(10%);
  }
  to {
    opacity: 1;
    clip-path: circle(100%);
  }
}

To customize the element while keeping fuctionnality, I recommend changing only the following properties:

  • animation-range: defines the start and end of the animation

And of course, you can change the animation itself by modifying the @keyframesrule or choosing your own one.

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