CSSPrimitiveValue: getFloatValue() method
=========================================

**Deprecated:** This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

 The **`getFloatValue()`** method of the
 `CSSPrimitiveValue` interface is used to get a float value in a specified
 unit. If this CSS value doesn't contain a float value or can't be converted into the
 specified unit, a `DOMException` is raised.


**Note:** This method was part of an attempt to create a typed CSS Object Model. This attempt has been abandoned, and most browsers do
 not implement it.


To achieve your purpose, you can use:

* the untyped CSS Object Model, widely supported, or
* the modern CSS Typed Object Model API, less supported and considered experimental.

Syntax
------


```js
getFloatValue(unit)
```

### Parameters

`unit`

 An `unsigned short` representing the code for the unit type, in which the
 value should be returned. Valid values are:


| Constant | Description |
| --- | --- |
| `CSS_CM` | The value is a `<length>` in centimeters. |
| `CSS_DEG` | The value is an `<angle>` in degrees. |
| `CSS_DIMENSION` | The value is a `<number>` with an unknown dimension. |
| `CSS_EMS` | The value is a `<length>` in em units. |
| `CSS_EXS` | The value is a `<length>` in ex units. |
| `CSS_GRAD` | The value is an `<angle>` in grads. |
| `CSS_HZ` | The value is a `<frequency>` in Hertz. The value can be obtained by using the getFloatValue method. |
| `CSS_IN` | The value is a `<length>` in inches. |
| `CSS_KHZ` | The value is a `<frequency>` in Kilohertz. |
| `CSS_MM` | The value is a `<length>` in millimeters. |
| `CSS_MS` | The value is a `<time>` in milliseconds. |
| `CSS_NUMBER` | The value is a simple `<number>`. |
| `CSS_PC` | The value is a `<length>` in picas. |
| `CSS_PERCENTAGE` | The value is a `<percentage>`. |
| `CSS_PT` | The value is a `<length>` in points. |
| `CSS_PX` | The value is a `<length>` in pixels. |
| `CSS_RAD` | The value is an `<angle>` in radians. |
| `CSS_S` | The value is a `<time>` in seconds. |

### Return value

A `float` value in the specified unit.

### Exceptions

| **Type** | **Description** |
| --- | --- |
| `DOMException` | 
 An `INVALID_ACCESS_ERR` is raised if the CSS value doesn't
 contain a float value or if the float value can't be converted into the
 specified unit.
  |

Examples
--------


```js
const cs = window.getComputedStyle(document.body);
const cssValue = cs.getPropertyCSSValue("margin-top");
console.log(cssValue.getFloatValue(CSSPrimitiveValue.CSS\_CM));
```

Specifications
--------------

 This feature was originally defined in the DOM Style Level 2 specification, but has been dropped from any
 standardization effort since then.

It has been superseded by a modern, but incompatible, CSS Typed Object Model API that is now on the standard track.

Browser compatibility
---------------------

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