flexbox-extent-start-001.html

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<!doctype html>

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     Any copyright is dedicated to the Public Domain.

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<title>An example of 'row-rule-extent: start'</title>

<style>

html,body {

  color:black; background-color:white; font:20px/1 monospace; padding:0; margin:0;

.flex {

  display: flex;

  flex-wrap: wrap;

  gap: 16px;

  column-rule: 8px solid orange;

  row-rule: 60% solid blue;

  row-rule-extent: start;

  place-content: center;

  border: 5px solid;

  margin: 2em;

  block-size: 6em;

  inline-size: 200px;

  background: lightgrey;

x {

  inline-size: 50px;

  block-size: 2em;

  background: grey;

  opacity: .6;

x:nth-child(1) { order: 2; }

x:nth-child(2) { inline-size: 45px; }

x:nth-child(3) { inline-size: 35px; }

x:nth-child(4) { inline-size: 60px; }

</style>

<div class="flex"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x></div>