files/en-us/web/css/reference/properties/left/index.md
The left CSS property participates in specifying the horizontal position of a positioned element. This {{glossary("inset properties", "inset property")}} has no effect on non-positioned elements.
{{InteractiveExample("CSS Demo: left")}}
left: 0;
left: 4em;
left: 10%;
left: 20px;
<section id="default-example">
<div class="example-container">
<div id="example-element">I am absolutely positioned.</div>
<p>
As much mud in the streets as if the waters had but newly retired from the
face of the earth, and it would not be wonderful to meet a Megalosaurus,
forty feet long or so, waddling like an elephantine lizard up Holborn
Hill.
</p>
</div>
</section>
.example-container {
border: 0.75em solid;
padding: 0.75em;
text-align: left;
position: relative;
width: 100%;
min-height: 200px;
}
#example-element {
background-color: #264653;
border: 4px solid #ffb500;
color: white;
position: absolute;
width: 140px;
height: 60px;
}
/* <length> values */
left: 3px;
left: 2.4em;
left: anchor(--my-anchor 50%);
left: calc(anchor-size(--my-anchor inline, 100px) * 2);
/* <percentage>s of the width of the containing block */
left: 10%;
/* Keyword value */
left: auto;
/* Global values */
left: inherit;
left: initial;
left: revert;
left: revert-layer;
left: unset;
{{cssxref("<length>")}}
anchor() function values), and the {{cssxref("anchor-size()")}} function resolves to a {{cssxref("<length>")}} value relative to the associated anchor element's width or height (see Setting element position based on anchor size).{{cssxref("<percentage>")}}
auto
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 is also auto, the element is not moved horizontally at all.The effect of left depends on how the element is positioned (i.e., the value of the {{cssxref("position")}} property):
position is set to absolute or fixed, the left property specifies the distance between the element's outer margin of left edge and the inner border of left edge of its containing block. (The containing block is the ancestor to which the element is relatively positioned.) If the positioned element has an associated anchor element, and the property value includes an {{cssxref("anchor()")}} function, left positions the left edge of the positioned element relative to the position of the specified <anchor-side> edge. The left property is compatible with the left, right, start, end, self-start, self-end, center, and <percentage> values.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 is used to compute the sticky-constraint rectangle.position is set to static, the left property has no effect.When both left and {{cssxref("right")}} are defined, and width constraints don't prevent it, the element will stretch to satisfy both. If the element cannot stretch to satisfy both, the position of the element is overspecified. When this is the case, the left value has precedence when the container is left-to-right; the right value has precedence when the container is right-to-left.
{{cssinfo}}
{{csssyntax}}
<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 id="example_5">
<pre>
position: absolute;
right: 0;
left: 0;
top: 200px;
</pre>
<p>Absolute position with both left and right declared</p>
</div>
</div>
</div>
#wrap {
width: 700px;
margin: 0 auto;
background: #5c5c5c;
}
pre {
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;
}
#example_5 {
position: absolute;
right: 0;
left: 0;
top: 100px;
background-color: #d7ffc2;
}
{{EmbedLiveSample('Positioning_elements',1200,650)}}
{{Specifications}}
{{Compat}}