如何使用CSS样式订购列表

使用CSS可以完全控制有序列表的样式；1. 通过list-style-type属性可更改编号样式，如decimal、lower-alpha、upper-alpha、lower-roman和upper-roman；2. 使用CSS计数器可实现高级定制，例如在编号后添加符号或加粗显示；3. 通过调整padding和margin控制列表项的间距与布局；4. 对嵌套列表可逐层设置不同样式，如ol使用decimal，ol ol使用lower-alpha，ol ol ol使用lower-roman以形成层级结构；通过这些方法，可使有序列表符合设计需求并保持跨浏览器一致性。

Styling an ordered list with CSS is straightforward and gives you full control over how the numbers and list items appear. By default, ordered lists (<ol></ol>) display numbers in a simple sequence (1, 2, 3, etc.), but you can customize the numbering style, spacing, alignment, and more.

Change the Number Style with list-style-type

You can change how the list markers (numbers) are displayed using the list-style-type property. Here are common options:

• decimal – Standard numbers (1, 2, 3) — this is the default
• lower-alpha – Lowercase letters (a, b, c)
• upper-alpha – Uppercase letters (A, B, C)
• lower-roman – Lowercase Roman numerals (i, ii, iii)
• upper-roman – Uppercase Roman numerals (I, II, III)

ol {
  list-style-type: upper-roman;
}

This will display your list as I, II, III, etc.

Customize Counter with CSS Counters (Advanced Styling)

For more control — like adding prefixes, custom formatting, or nested list styles — use CSS counters.

Example: Add a period after the number and make it bold:

ol {
  counter-reset: section;
  list-style: none;
}

ol li {
  counter-increment: section;
}

ol li::before {
  content: counter(section) ". ";
  font-weight: bold;
  margin-right: 8px;
}

This method lets you fully customize the appearance of the numbers, including combining them with text or symbols.

Control Spacing and Layout

By default, browsers apply margins and padding to <ol>. You can adjust these to fit your design:

ol {
  padding-left: 20px;
  margin-bottom: 20px;
}

ol li {
  margin: 10px 0;
  line-height: 1.5;
}

Use padding-left to control the space between the number and the text. Avoid using margin-left on li elements, as it can misalign the markers.

Nested List Styling

Ordered lists inside ordered lists can have different styles. You can target nested levels like this:

ol {
  list-style-type: decimal;
}

ol ol {
  list-style-type: lower-alpha;
}

ol ol ol {
  list-style-type: lower-roman;
}

This creates a hierarchy: 1 → a → i, which is great for outlines or legal documents.

Basically, with list-style-type, CSS counters, and proper spacing, you can make ordered lists match any design. Just remember to test readability and consistency across browsers.

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