Why Doesn't My CSS `text-decoration: none;` Override Nested Elements?

Troubleshooting CSS text-decoration Override

Your concern regarding your CSS code not overriding the text-decoration property is a common challenge faced by many programmers. Let's dive into the issue and find a solution.

The key to understanding the issue lies in the behavior of text-decoration, which differs from other font-related properties like font-weight. When applied, text-decoration affects all nested elements, regardless of their specificity. This is explained in the W3C specification:

Text decorations on inline boxes are drawn across the entire element, going across any descendant elements without paying any attention to their presence.

In your code, the text-decoration: none; rule, which should prevent underlining, is applied to li elements with the u class. However, because text-decoration affects nested elements as well, the underline remains in the nested li elements with the u class.

To resolve this issue, you can use a combination of CSS specificity and nesting:

ul > li {
    text-decoration: none;
}
ul > li.u {
    text-decoration: underline;
}
ul > li > ul > li {
    text-decoration: line-through; /* Apply a different line-through style */
}
ul > li > ul > li.u {
    text-decoration: underline;
}

By using this approach, the line-through style is applied to the nested li elements without affecting the outer li elements. Alternatively, you can also utilize the inheritance property explicitly to set the text-decoration for the nested elements:

ul > li > ul {
    text-decoration: inherit;
}

Remember, when troubleshooting CSS issues, understanding how properties behave and the specificity rules can help you find effective solutions.

The above is the detailed content of Why Doesn't My CSS `text-decoration: none;` Override Nested Elements?. For more information, please follow other related articles on the PHP Chinese website!