CSS Reference Property

left 1u1r3

The left property is an offset property that is used to specify the left offset of a positioned element with respect to its positioning context. d5bv

It is one of four available offset properties that also include bottom.

Offset properties are used to specify the exact position value other than the default static.

The left property specifies how far an absolutely positioned element’s left margin edge is offset relative to the left edge of the element’s positioning context, which is usually its containing block. For relatively positioned elements, the offset is with respect to the left edge of the element itself (i.e., the element is given a position in the normal flow, then offset from that position according to the offset properties). For fixed and sticky elements the positioning context is the viewport.

You should read the position property entry for details on how to choose a position for an element to use the offset properties on it.

Official Syntax 55184y

Syntax:
```
left: <length> | <percentage> | auto
```
Initial: auto
Applies To: positioned elements
Animatable: yes, as a length, percentage or calc();

Values 584j31

<length>

The left offset is specified as a fixed length. See the <length> entry for a list of possible length values and units.

Negative values are allowed. A positive value will offset the element to the right from the left edge of its positioning context, while a negative value will offset to the left with respect to the left edge of the context.

<percentage>

The left offset is specified as a percentage of its containing block’s height. See the <length> entry for a list of possible length values and units.

auto

When left is set to auto then:

If the element is relatively positioned, it will be positioned (horizontally) according to the value of the bottom.)
If the element is absolutely positioned, it will be positioned (horizontally) according to the value of the width is width: auto, it will get its width based on its content—it usually expands to fill the entire available width inside its containing block.

Notes z5jo

The left offset property also accepts a value of inherit, which allows the element to inherit its left offset from its parent. The element’s parent may not be its positioning context.

Examples 3e5p5z

The following example offsets an absolutely positioned element by 30px the the right of the left edge of its containing block (which in this case is its positioning context).

.container {
    position: relative; /* establishes a positioning context for its absolutely positioned descendants and for itself */
}

.absolutely-positioned {
    position: absolute;
    left: 30px;
}

Live Demo 2x4j2k

View this demo on the Codrops Playground

Browser k5t66

The left property is ed in all major browsers: Chrome, Firefox, Safari, Opera, Internet Explorer, and on Android and iOS.

Referencia de CSS3 325u2m