column-gap-decorations-spanner-after-empty-lanes-ref.html

Enable keyboard shortcuts

<!DOCTYPE html>

<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">

<link rel="help" href="https://drafts.csswg.org/css-gaps-1/#geometry">

<link rel="help" href="https://drafts.csswg.org/css-grid-3/">

<style>

  body { margin: 0; }

  .lanes {

    display: grid-lanes;

    grid-template-columns: repeat(3, 80px);

    gap: 20px;

    background: #cdd5e0;

    width: max-content;

  .lanes > div { grid-column: 1; height: 60px; background: #5b8def; }

  .lanes > div.span { grid-column: 1 / -1; background: #8a6df0; }

  .col-rule { position: absolute; width: 0; border-left: 4px solid blue; }

</style>

<div class="lanes">

  <div></div>

  <div class="span"></div>

  <div></div>

</div>

<div class="col-rule" style="left: 88px; top: 0; height: 60px;"></div>

<div class="col-rule" style="left: 88px; top: 160px; height: 60px;"></div>

<div class="col-rule" style="left: 188px; top: 0; height: 60px;"></div>

<div class="col-rule" style="left: 188px; top: 160px; height: 60px;"></div>