Structuring Content Using Unordered and Ordered Lists in HTML
Jul 09, 2025 am 12:05 AM
Unordered lists are suitable for items without a specific order, and are wrapped with
<ul> tags, and each entry is represented by <li>; an ordered list is used for content with order requirements, and is wrapped with <ol> tags, and each entry is also represented by <li>. 1. Unordered lists use dots as marking symbols by default, and are often used in scenarios such as website navigation menus, article labels or product feature introductions. 2. The ordered list is displayed in sequence through numbering, suitable for operation steps, competition rankings or teaching processes, and the numbering style can be defined through type attributes. 3. Lists can be used in nesting, and they can be included in each other, but you need to pay attention to issues such as indentation, hierarchy, and semantics to improve readability and SEO effect.
In web development, lists are one of the most common ways to organize information. HTML provides two basic list structures: unordered list and ordered list. They not only improve the readability of the page, but also help search engines better understand content structure.
What are unordered and ordered lists?
Unordered lists are suitable for items without a specific order, such as shopping lists, hobbies, etc., and are wrapped with <ul></ul> tags, and each entry is represented by <li> .
Ordered lists are used for content with order requirements, such as step instructions, rankings, etc., and are wrapped with <ol></ol> tags, and each entry is also represented by <li> .
For example:
<ul>
<li>
Unordered list:
<ul> <li> bread <li> milk <li> egg <li>Ordered list:
<ol> <li> Open a browser <li> Enter the URL <li> Press EnterBoth lists can be used in nesting to build more complex structures, such as menu navigation or multi-level task listings.
How to use unordered lists correctly?
When there is no order between the content items you list, you should use an unordered list. It uses dots as marker by default, but can also be customized with CSS.
Common usage scenarios include:
<ul> <li> Website navigation menu <li> Article tags or keywords <li> Product Features Introduction The writing method is very simple, you only need to wrap multiple <li> in one <ul></ul> :
<ul> <li>Home </li> <li>About Us</li> <li>Contact Us</li> </ul>
If you want the list to look more beautiful, you can use images, icons, or custom colors to replace the default dots with CSS.
When should I use an ordered list?
When your content needs to be displayed in order, such as operational steps, competition rankings, teaching processes, etc., an ordered list should be used.
For example, the steps to make a cake:
<ol><li> Prepare materials<li> Mix flour and eggs<li> Pour into the mold<li> Put in the oven to bakeIts HTML structure is also very straightforward:
<ol> <li>Preparation of materials</li> <li>Mix flour and eggs</li> <li>Pour into mold</li> <li>Put in the oven to bake</li> </ol>
You can also change the numbering style through type attribute, such as using letters or Roman numerals:
type="A" : capital letters<li> type="a" : lowercase letters<li> type="I" : capital Roman numeral<li> type="i" : lowercase Roman numeralThis allows you to choose the appropriate numbering method according to the content style.
List nesting and notes
Sometimes we need to include another list in one list item, which requires the use of nested structure. Whether it is <ul> or <ol> , it can be nested with each other.
For example, a menu may have first-level classification and sub-category:
<ul>
<li>Home </li>
<li>Products<ul>
<li>Mobile phone</li>
<li>Computer</li>
<li>Accessories</li>
</ul>
</li>
<li>Service</li>
</ul>The following points should be paid attention to when nesting:
<ul> <li> The internal list should be indented to facilitate reading of the source code <li> Each<li> can contain only one sublist unless you explicitly want multiple block-level elements to be displayed in parallel
<li> Do not over-neck, as above three layers will reduce maintainability and readability
In addition, semantics are also important. Using the right tags not only helps SEO, but also helps screen readers identify content structures.
Basically that's it. Mastering the use of disordered and ordered lists can make your web page content more organized and easier to be understood by users and crawled by search engines.
The above is the detailed content of Structuring Content Using Unordered and Ordered Lists in HTML. For more information, please follow other related articles on the PHP Chinese website!
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