The left
CSS property participates in specifying the horizontal position of a positioned element. It has no effect on non-positioned elements.
The effect of left
depends on how the element is positioned (i.e., the value of the position
property):
position
is set to absolute
or fixed
, the left
property specifies the distance between the element's left edge and the left edge of its containing block. (The containing block is the ancestor to which the element is relatively positioned.)position
is set to relative
, the left
property specifies the distance the element's left edge is moved to the right from its normal position.position
is set to sticky
, the left
property behaves like its position
is relative
when the element is inside the viewport, and like its position
is fixed
when it is outside.position
is set to static
, the left
property has no effect.When both left
and right
are defined, the position of the element is overspecified. When this is the case, the left
value has precedence when the container is left-to-right (thus, the computed value of right
is set to -left
); the right
value has precedence when the container is right-to-left (thus, the computed value of left
is set to -right
).
/* <length> values */ left: 3px; left: 2.4em; /* <percentage>s of the width of the containing block */ left: 10%; /* Keyword value */ left: auto; /* Global values */ left: inherit; left: initial; left: unset;
<length>
<length>
that represents: <percentage>
<percentage>
of the containing block's width.auto
right
property, while width: auto
is treated as a width based on the content; or if right
is also auto
, the element is positioned where it should horizontally be positioned if it were a static element.right
property; or if right
is also auto
, the element is not moved horizontally at all.inherit
<length>
, <percentage>
, or the auto
keyword.<length> | <percentage> | auto
#wrap { width: 700px; margin: 0 auto; background: #5C5C5C; } pre { white-space: pre; white-space: pre-wrap; white-space: pre-line; word-wrap: break-word; } #example_1 { width: 200px; height: 200px; position: absolute; left: 20px; top: 20px; background-color: #D8F5FF; } #example_2 { width: 200px; height: 200px; position: relative; top: 0; right: 0; background-color: #C1FFDB; } #example_3 { width: 600px; height: 400px; position: relative; top: 20px; left: 20px; background-color: #FFD7C2; } #example_4 { width:200px; height:200px; position:absolute; bottom:10px; right:20px; background-color:#FFC7E4; }
<div id="wrap"> <div id="example_1"> <pre> position: absolute; left: 20px; top: 20px; </pre> <p>The only containing element for this div is the main window, so it positions itself in relation to it.</p> </div> <div id="example_2"> <pre> position: relative; top: 0; right: 0; </pre> <p>Relative position in relation to its siblings.</p> </div> <div id="example_3"> <pre> float: right; position: relative; top: 20px; left: 20px; </pre> <p>Relative to its sibling div above, but removed from flow of content.</p> <div id="example_4"> <pre> position: absolute; bottom: 10px; right: 20px; </pre> <p>Absolute position inside of a parent with relative position</p> </div> </div> </div>
Specification | Status | Comment |
---|---|---|
CSS Transitions The definition of 'left' in that specification. | Working Draft | Defines left as animatable. |
CSS Positioned Layout Module Level 3 The definition of 'left' in that specification. | Working Draft | Adds behavior for sticky positioning. |
CSS Level 2 (Revision 1) The definition of 'left' in that specification. | Recommendation | Initial definition. |
Initial value | auto |
---|---|
Applies to | positioned elements |
Inherited | no |
Percentages | refer to the width of the containing block |
Media | visual |
Computed value | if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto
|
Animation type | a length, percentage or calc(); |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1 | 12 | 1 | 5.5 | 5 | 1 |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | 1 | Yes | Yes | 4 | Yes | 1 | Yes |
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https://developer.mozilla.org/en-US/docs/Web/CSS/left