present lists and sublists in html

Question

how to organize html code (with usage ol\li ect.) to present such lists (with sublists)

1. BLA-BLA-BLA

1.1. Bla-bla-bla.
1.2. Bla-bla-bla.
1.3. Bla-bla-bla:
  lalal - balalala;
  lalal - balalala;
  lalal - lalalla.
1.4. Blal-a lalslas
1.4.1. bklalala
1.4.2. sdsdsdsdsd

note: It is not the same that I want

Answer 1

ol tag means ordered list (with numbers).

ul tag means unordered one.

Overlapping ol lists allow this kind of presentation : 1.1.2

<ol>
  <li>BLA-BLA-BLA
    <ol>
      <li> Bla-bla-bla.</li>
      <li> Bla-bla-bla.</li>
      <li> Bla-bla-bla.
        <ul>
          <li>lalal - balalala;</li>
        </ul>
      </li>
    </ol>
  </li>
</ol>