left

Sumario

La propiedad left especifica parte de la posición de un elemento (posicionado - es decir, con una posición determinada por código).

Para los elementos con una posición absoluta (aquellos que tienen la propiedad position: absolute ó position: fixed), la propiedad left determina la distancia entre el margen izquierdo del elemento y el borde izquierdo de su bloque contenedor.

Valor inicial	`auto`
Applies to	positioned elements
Heredable	no
Percentages	refer to the width of the containing block
Media	visual
Valor calculado	if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, `auto`
Animatable	yes, as a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a `calc()` function that is the sum of a length and a percentage (each possibly zero), and these `calc()` functions have each half interpolated as real numbers.
Canonical order	el orden único no-ambigüo definido por la gramática formal

Sintaxis

left: <length> | <percentage> | auto | inherit ;

Valores

<length>: Una longitud, un valor negativo, cero, un valor positivo.
<percentage>: Un porcentaje del ancho del bloque contenedor.

Ejemplos

CSS

#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;
}

HTML

<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>

Especificaciones

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	1.0	1.0 (1.7 or earlier)	5.5	5.0	1.0

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	1.0	1.0 (1)	6.0	6.0	1.0

Ver también

position, top, right, bottom