text-decoration 和 text-decoration-line 不同，前者是用于同時(shí)設(shè)置線條類型、顏色和樣式的簡寫屬性，適合一次性定義所有樣式；后者僅用于指定線條類型，適合控制線條種類而不影響顏色或樣式。1. text-decoration 可組合設(shè)置線條類型、樣式和顏色，適用于快速重置或自定義鏈接樣式；2. text-decoration-line 僅控制線條種類，適合疊加效果或保留默認(rèn)樣式細(xì)節(jié)；3. 使用 text-decoration 可能會覆蓋 text-decoration-line 的設(shè)置，因?yàn)樗呛唽憣傩裕?. 注意兩者的瀏覽器支持差異，text-decoration-line 在較舊瀏覽器中可能不受支持。

If you've ever tried styling text underlines or other line decorations in CSS, you might have come across both text-decoration and text-decoration-line. They seem similar, but they serve different purposes and have distinct levels of control. Let’s break it down.

What is text-decoration?

text-decoration is a shorthand property that controls the appearance of decorative lines on text — like underlines, overlines, and line-throughs. It also lets you set the color and style (solid, dotted, etc.) of those lines.

For example:

a {
  text-decoration: underline solid red;
}

This rule adds a red solid underline to links.

Key points:

• Combines multiple aspects: line type (underline, line-through, etc.), style, and color.
• Used when you want to define everything at once.
• Older and more widely supported than text-decoration-line.

What is text-decoration-line?

text-decoration-line specifically defines which types of lines appear on the text — like whether it's underlined, struck through, or has an overline.

Example:

p {
  text-decoration-line: underline line-through;
}

This will apply both an underline and a line-through on paragraph text.

Important notes:

• Only controls which lines are applied.
• No ability to change color or style directly.
• Newer property, so support is good but not quite universal (still very safe for modern use).

When to Use Which?

Use text-decoration-line when you only need to control what kind of line appears — especially useful if you're layering multiple effects or working with system-level defaults you don’t want to override.

Use text-decoration when you want full control — setting line type, color, and style all in one go. It's especially handy for quick resets or custom link styles.

Here’s a quick comparison:

• ? text-decoration: All-in-one control
• ?? text-decoration-line: Line types only

Also worth noting: If you use text-decoration, it will overwrite any previous settings from text-decoration-line, since it's a shorthand.

A Few Common Pitfalls

• Confusing them as interchangeable: They look similar but do different jobs.
• Overwriting styles unintentionally: Using text-decoration can reset color and style if not specified.
• Old browser quirks: Some older browsers may not fully support text-decoration-line.

So yes, they’re related, but no, they aren't the same. Pick based on how much detail you need.

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