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## CSS tab-size Property The `tab-size` property in CSS is used to customize the width of a tab character (`\t`). In standard HTML, tab characters are typically collapsed and displayed as a single space. However, for elements where whitespace is preserved—such as `

` (preformatted text) and ``—the `tab-size` property allows developers to control how many spaces or what physical length a tab character should represent.

---

## Syntax

```css
tab-size: number | length | initial | inherit;
```

### Property Values

| Value | Description |
| :--- | :--- |
| **`number`** | Represents the number of space characters (` `) to display for each tab character. The default value is `8`. |
| **`length`** | Specifies the width of a tab character using CSS length units (e.g., `px`, `em`, `rem`). *Note: Historically, browser support for length units was limited, but modern browsers now support them fully.* |
| **`initial`** | Sets the property to its default value (`8`). |
| **`inherit`** | Inherits the property value from its parent element. |

---

## Specifications & Technical Details

* **Default Value:** `8`
* **Inherited:** Yes
* **Animatable:** No
* **CSS Version:** CSS3 / CSS Text Module Level 3
* **JavaScript Syntax:** `object.style.tabSize = "4";`

---

## Code Examples

### Example 1: Setting Tab Size Using Numbers (Spaces)
This is the most common use case. It sets the tab character width to represent exactly 4 spaces (the modern standard for code indentation) instead of the default 8 spaces.

```css
/* Standard syntax for modern browsers */
pre {
  tab-size: 4;
}

/* Legacy browser support (Firefox & Opera) */
pre {
  -moz-tab-size: 4; /* Legacy Firefox */
  -o-tab-size: 4;   /* Legacy Opera */
  tab-size: 4;      /* Standard */
}
```

### Example 2: Setting Tab Size Using Length Units
You can also define the tab width using absolute or relative CSS length units like `em` or `px`.

```css
pre.custom-tabs {
  /* Sets the tab width to exactly 50 pixels */
  tab-size: 50px;
}

code.tight-tabs {
  /* Sets the tab width relative to the font size */
  tab-size: 2em;
}
```

---

## Browser Support

The `tab-size` property is widely supported across all modern web browsers:

* **Google Chrome:** Supported (v21+)
* **Microsoft Edge:** Supported (v12+)
* **Mozilla Firefox:** Supported (v91+ without prefix; v4+ with `-moz-` prefix)
* **Safari:** Supported (v6.1+)
* **Opera:** Supported (v15+ without prefix; v10.6+ with `-o-` prefix)

### Important Considerations
1. **Whitespace Preservation:** The `tab-size` property will only have a visible effect if the element preserves whitespace. Ensure the element has `white-space: pre`, `white-space: pre-wrap`, or is a native `<pre>` or `<textarea>` element.
2. **Fallback:** If you are targeting older legacy browsers, it is recommended to include the `-moz-` vendor prefix alongside the standard property.</div><div class="post-nav"><a href="/post/css3-pr-text-align-last.html">← Css3 Pr Text Align Last</a><a href="/post/css3-pr-order.html">Css3 Pr Order →</a></div></div>
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