Can ordered list produce result that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, …) with css?

You can use counters to do so:

The following style sheet numbers nested list items as “1”, “1.1”, “1.1.1”, etc.

OL { counter-reset: item }
LI { display: block }
LI:before { content: counters(item, ".") " "; counter-increment: item }

Example

ol { counter-reset: item }
li{ display: block }
li:before { content: counters(item, ".") " "; counter-increment: item }
<ol>
  <li>li element
    <ol>
      <li>sub li element</li>
      <li>sub li element</li>
      <li>sub li element</li>
    </ol>
  </li>
  <li>li element</li>
  <li>li element
    <ol>
      <li>sub li element</li>
      <li>sub li element</li>
      <li>sub li element</li>
    </ol>
  </li>
</ol>

See Nested counters and scope for more information.

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