row-gap-decorations-inset-cap-vs-junction-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-rows: repeat(3, 60px);

    gap: 20px;

    background: #cdd5e0;

    width: max-content;

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

  .a { grid-row: 1; width: 80px; }

  .b { grid-row: 1; width: 60px; }

  .c { grid-row: 2; width: 80px; }

  .d { grid-row: 3; width: 120px; }

  .e { grid-row: 3; width: 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="a"></div>

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

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

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

  <div class="e"></div>

</div>

<div class="col-rule" style="left: 88px; top: 10px; height: 34px;"></div>

<div class="col-rule" style="left: 128px; top: 168px; height: 48px;"></div>

<div class="row-rule" style="top: 68px; left: 0; width: 200px;"></div>

<div class="row-rule" style="top: 148px; left: 0; width: 200px;"></div>