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Add scroll-markers feature #2654

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Add scroll-markers feature #2654

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4 changes: 4 additions & 0 deletions features/scroll-markers.yml
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name: Scroll markers
description: The `::scroll-marker` CSS pseudo-element is a focusable control within its ancestor scroll container's `::scroll-marker-group` that scrolls to its originating element.
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I'm having trouble understanding this. Would you mind giving me a practical example of how this might work/what this would look like? This would help me understand, and potentially propose a slight rewrite of this.

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If you have chrome canary with experimental web platform features enabled, there are some great demos at:

As an example, the following creates a set of circular "markers" to scroll to each of the slides in a slideshow:

<style>
  .slides {
    overflow: auto;
    scroll-snap-type: x mandatory;
    white-space: nowrap;
    scroll-marker-group: after;
    counter-reset: slide-number;
  }
  .slide::scroll-marker {
    counter-increment: slide-number;
    content: counter(slide-number);
    border-radius: 50%;
    border: 1px solid black;
  }
}
</style>
<div class=slides>
  <div class=slide></div>
  <div class=slide></div>
  <div class=slide></div>
  <div class=slide></div>
  <div class=slide></div>
<div class=slideshow>

Here's a somewhat simple codepen trying to show the same: https://codepen.io/flackr/pen/MWMLPpP

spec: https://drafts.csswg.org/css-overflow-5/#scroll-markers
group: scrolling