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Table of Contents
Ordered List vs. Unordered List: When to use which one?
How to create nested lists?
List common misunderstandings and optimization tips
Home Web Front-end HTML Tutorial Implementing lists in HTML: Ordered vs. Unordered and nested lists.

Implementing lists in HTML: Ordered vs. Unordered and nested lists.

Jul 02, 2025 pm 04:05 PM
html list Nested List

In HTML, lists are used to organize content. Ordered lists (

<ol>) are suitable for sequential entries, such as step instructions; unordered lists ( <ul>) are suitable for sequential entries, such as shopping lists; nested lists show hierarchies by including new lists in list items, such as submenu under navigation menus. When choosing, consider whether the order is important, and note that the nesting level should not be too deep, use appropriate tags, and cooperate with CSS control styles, while avoiding semantic errors and accessibility issues.

Implementing lists in HTML: Ordered vs. Unordered and nested lists.

In HTML, lists are an important way to organize content. Common Ordered List and Unordered List are used to express sequential and unordered entry information respectively. If you want to make the structure clearer and more hierarchical, you can also use nested lists .

Implementing lists in HTML: Ordered vs. Unordered and nested lists.

Ordered List vs. Unordered List: When to use which one?

Simply put:

Implementing lists in HTML: Ordered vs. Unordered and nested lists.<ul>
  • Ordered list ( <ol></ol> ) : Applicable to content that needs to emphasize order, such as step descriptions, rankings, etc.

     <ol>
      <li>Step 1: Open the browser</li>
      <li>Step 2: Enter the URL</li>
      <li>Step 3: Click to search</li>
    </ol>
  • Unordered list ( <ul> ) : Suitable for items without a specific order, such as shopping lists, feature introductions, etc.

    Implementing lists in HTML: Ordered vs. Unordered and nested lists.
     <ul>
      <li>Milk</li>
      <li>Egg</li>
      <li>Bread</li>
    </ul>
  • When choosing, you can ask yourself a question: "Is the order of these entries important?" If so, use <ol> ; otherwise use <ul> .


    How to create nested lists?

    A nested list is to include a list in a list item, which is suitable for displaying hierarchical structures or classified content.

    For example, if you want to list different pages and their subpages of a website, you can write it like this:

     <ul>
      <li>Home </li>
      <li>Products<ul>
          <li>Product A</li>
          <li>Product B</li>
        </ul>
      </li>
      <li>Contact Us</li>
    </ul>

    As you can see, <ul> or <ol> can appear as child elements of another list. Pay attention to indentation when nesting. Although HTML is not mandatory, it helps to read the code.

    A few suggestions:

    <ul>
  • The nesting should not be too deep, it is more appropriate to within three layers;
  • Use appropriate tags for each layer (do not mix <ol> and <ul> );
  • If the styles are unified, you can use CSS to control the display effect at different levels.

  • List common misunderstandings and optimization tips

    Sometimes newbies use the list incorrectly or ignore semantics and accessibility. Here are some easy points to ignore:

    <ul>
  • ? Use paragraphs plus numbers to simulate ordered lists;
  • ? Forcibly wrap the navigation bar with <ul> but do not set role="navigation" ;
  • ? The nested structure is confusing, resulting in screen reader recognition errors.
  • Correct ways to do this include:

    <ul>
  • Use semantic tags to improve accessibility and SEO;
  • Add appropriate class or id to nested lists for easy style control;
  • For complex structures, it can be used with <dl> (Definition List).
  • For example, a list with styles might be as follows:

     <ul class="menu">
      <li><a href="/">Home</a></li>
      <li><a href="/about">About Us</a></li>
    </ul>

    Then set the margins, colors and other styles of .menu li through CSS.


    Basically that's it. HTML lists may seem simple, but they are not easy to use in actual development. Master the basic syntax and usage scenarios, pay attention to clear structure and accurate semantics, and you can write code that is both practical and easy to maintain.

    The above is the detailed content of Implementing lists in HTML: Ordered vs. Unordered and nested lists.. For more information, please follow other related articles on the PHP Chinese website!

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