There’s a new type of CSS scroll-state query coming: scrolled

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Unlike the scrollable scroll-state queries, scrolled remembers the last direction you scrolled into, which you can use to build “hidey bars”: when scrolling down (or having scrolled down), the hidey bar hides itself. When then scrolling back up, the hidey bar reveals itself.

Here’s the code that is needed to hide a fixed header when scrolling down:

html {
  container-type: scroll-state;
}

header {
  transition: translate 0.25s;
  translate: 0 0;

  /* Slide header up when last having scrolled towards the bottom */
  @container scroll-state(scrolled: bottom) {
    translate: 0 -100%;
  }
}

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Below is a live demo using the code above. You can try it out yourself in Chrome Canary with the experimental Web Platform Features Flag enabled. If you browser does not support scrolled scroll-state queries, the header will remain fixed in place – a nice progressive enhancement if you’d ask me 🙂

See the Pen
Hidey Bar Demo (Hide on Scroll Down, Show on Scroll Up // Scroll State Queries) by Bramus (@bramus)
on CodePen.

The feature is expected to ship to Chrome Stable in Chrome 144.

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Bramus is a frontend web developer from Belgium, working as a Chrome Developer Relations Engineer at Google. From the moment he discovered view-source at the age of 14 (way back in 1997), he fell in love with the web and has been tinkering with it ever since (more …) View more posts