CSSPrimitiveValue: setFloatValue() 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 setFloatValue() method of the CSSPrimitiveValue interface is used to set a float value. If the property attached to this value can't accept the specified unit or the float value, the value will be unchanged and a DOMException will be 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:


setFloatValue(unitType, floatValue)



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.

A float representing the new float value.

Return value

None (undefined).


Type Description
DOMException An INVALID_ACCESS_ERR is raised if the CSS value doesn't contain a float value or if the string value can't be converted into the specified unit.
An NO_MODIFICATION_ALLOWED_ERR is raised if this property is read-only.


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It has been superseded by a modern, but incompatible, CSS Typed Object Model API that is now on the standard track.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

BCD tables only load in the browser