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目录

Style width Property

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Example

Set the width of a <button> element:

document.getElementById("myBtn").style.width = "300px";
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Description

The width property sets or returns the width an element.

The width property has effect only on block-level elements or on elements with absolute or fixed position. The overflowing content can be manipulated with the overflow property.

Tip: Use the height property to set or return the height of an element.

Browser Support

Property
width Yes Yes Yes Yes Yes

Syntax

Return the width property:

object.style.width

Set the width property:

object.style.width = "auto| length|%|initial|inherit"

Property Values

Value Description
auto The browser sets the width. This is default
length Defines the width in length units
% Defines the width in % of the parent element
initial Sets this property to its default value. Read about initial
inherit Inherits this property from its parent element. Read about inherit

Technical Details

Default Value: auto
Return Value: A String, representing the width of an element
CSS Version CSS1

More Examples

Example

Change the width of a <div> element:

document.getElementById("myDIV").style.width = "500px";
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Example

Change the height and width of an <img> element:

document.getElementById("myImg").style.height = "300px";
document.getElementById("myImg").style.width = "300px";
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Example

Return the width of an <img> element:

alert(document.getElementById("myImg").style.width);
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Related Pages

CSS tutorial: CSS Dimension

CSS tutorial: CSS Box model

CSS reference: width property


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