column-gap-decorations-033-ref.html

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<!DOCTYPE html>

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

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

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

<style>

  body { margin: 0; }

  .lanes {

    display: grid-lanes;

    grid-template-columns: repeat(2, 60px);

    gap: 10px;

    background: #cdd5e0;

    width: max-content;

  .lanes > div {

    height: 40px;

    background: #5b8def;

    color: #fff;

    font: 600 12px/1 sans-serif;

  .first { grid-column: 1; }

  .spanner { grid-column: 1 / -1; }

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

  .row-rule { position: absolute; height: 0; border-top: 4px solid gold; }

</style>

<div class="lanes">

  <div class="first">A</div>

  <div class="spanner">X (span 2)</div>

</div>

<div class="col-rule" style="top: 0; left: 63px; height: 50px;"></div>

<div class="row-rule" style="top: 43px; left: 0; width: 60px;"></div>