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bottom style property

Browser support:

Specifies or returns the bottom coordinate of a positioned element.

A positioned element is an element whose position property is set to relative, absolute or fixed. The value of the bottom property specifies the bottom position of the element including the padding, scrollbar, border and the margin.

Use the left, top, right and bottom properties to specify the position for elements. You can set the size of an element with the width and height properties.

The type of the bottom property is string.

You can set or retrieve the value of the bottom property as an integer with the pixelBottom property. It contains the value in pixels.
If you want to get or set the bottom property as a floating-point number that specifies the value in the current unit type of the bottom property, use the posBottom property.

The properties mentioned above can be used to access style settings. If you need the bottom position of a rendered element you can use the (clientTop, clientHeight), (offsetTop, offsetHeight) and (scrollTop, scrollHeight) properties and the getBoundingClientRect method.

Syntax:

object.bottom;

You can find the related objects in the Supported by objects section below.

This property is read/write.

CSS page for this property: bottom

Possible values:

The type of this property is string.

One of the following values:

auto

Default. The bottom position of the object is in accordance with the default layout of the page.

inherit

Takes the value of this property from the computed style of the parent element.

position in length

The bottom position of the element in length units. For the supported length units, see the length page.

position in percentage

The bottom position is the specified percentage of the height of the parent object.

Default: auto.

Example HTML code 1:

This example illustrates the use of the bottom property:

<head>
    <style>
        .example {
            position: relative;
            bottom: 50px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="example">The bottom of this is 50px above the center line</div>
    <div style="border-top: 5px solid #408080;">Center-line</div>
</body>

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Example HTML code 2:

This example illustrates the use of the bottom property in JavaScript:

<head>
    <style>
        #myDiv {
            position: absolute; 
            right: 100px; 
            bottom: 100px;
            width: 200px;
            height: 50px;
            background-color: #c00000;
        }
    </style>
    <script type="text/javascript">
        function ChangeBottom () {
            var div = document.getElementById ("myDiv");
            var input = document.getElementById ("myInput");

            div.style.bottom = input.value + "px";
        }
    </script>
</head>
<body>
    <div id="myDiv">
        An absolute positioned division
    </div>

    <input id="myInput" type="text" value="100" />
    <button onclick="ChangeBottom ();">Change the bottom position!</button>
</body>