column-gap-decorations-inset-across-spanner-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/#inset">

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

<style>

  body { margin: 0; }

  .lanes {

    display: grid-lanes;

    grid-template-columns: repeat(2, 80px);

    gap: 20px;

    background: #cdd5e0;

    width: max-content;

  .lanes > div { background: #5b8def; }

  .lanes > div.span { grid-column: 1 / -1; height: 40px; background: #8a6df0; }

  .a { grid-column: 1; height: 60px; }

  .b { grid-column: 2; height: 60px; }

  .c { grid-column: 1; height: 60px; }

  .d { grid-column: 2; height: 60px; }

  .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="span"></div>

  <div class="a"></div>

  <div class="b"></div>

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

  <div class="c"></div>

  <div class="d"></div>

</div>

<div class="col-rule" style="left: 88px; top: 66px; height: 48px;"></div>

<div class="col-rule" style="left: 88px; top: 206px; height: 54px;"></div>

<div class="row-rule" style="top: 48px; left: 0; width: 80px;"></div>

<div class="row-rule" style="top: 128px; left: 0; width: 80px;"></div>

<div class="row-rule" style="top: 188px; left: 0; width: 80px;"></div>

<div class="row-rule" style="top: 48px; left: 100px; width: 80px;"></div>

<div class="row-rule" style="top: 128px; left: 100px; width: 80px;"></div>

<div class="row-rule" style="top: 188px; left: 100px; width: 80px;"></div>