CSS - inset-block Property

The CSS property inset-block determines the logical block start and end offsets of an element. It depends upon the writing mode, direction and text orientation of the element. It relates to the top and bottom, or left and right CSS properties.

It is a shorthand property for inset-block-end and inset-block-start CSS properties.

Possible Values

The CSS property inset-block takes the same set of values as left CSS property, which are as follows:

  • <length> − Can specify a negative, null or positive value.

  • <percentage> − Percentage of the container's width.

  • auto − Default value. Browser calculates the left position.

  • inherit − Specifies the same value as computed from its parent element.

Applies To

All positioned elements.

Syntax

inset-block = <'top'>{1,2}  

/* <length> values */
inset-block: 5px 10px;
inset-block: 5px; /* value applied to start and end */
inset-block: 3.4em 5em;
   
/* <percentage>s of the width or height of the containing block */
inset-block: 15% 10%;
   
/* Keyword value */
inset-block: auto;

CSS inset-block - Setting Offsets

The following example demonstrates the use of inset-block property with two length values passed to it, which determines the start and end offset values.

<html>
<head>
<style>
   div {
      background-color: purple;
      width: 180px;
      height: 120px;
      position: relative;
   }

   .inset-ex {
      text-orientation: sideways-right;
      direction: rtl;
      position: absolute;
      inset-block: 25px 45px;
      background-color: pink;
   }
</style>
</head>
<body>
   <div>
      <span class="inset-ex">inset-block</span>
   </div>
</body>
</html>

CSS inset-block - Percentage Value

The following example demonstrates the use of inset-block property with two percentage values passed to it, which determines the start and end offset values. The writing mode is set as horizontal-tb.

<html>
<head>
<style>
   div {
      background-color: purple;
      width: 180px;
      height: 120px;
      position: relative;
   }

   .inset-ex {
      writing-mode: horizontal-tb;
      position: absolute;
      inset: 20% 10%;
      background-color: pink;
   }
</style>
</head>
<body>
   <div>
      <span class="inset-ex">inset-block</span>
   </div>
</body>
</html>

CSS inset-block - Mixed Value

The following example demonstrates the use of inset-block property with mixed values (length and percentage) passed to it, which determines the start and end offset values. The writing mode is also set as vertical-lr.

<html>
<head>
<style>
   div {
      background-color: purple;
      width: 180px;
      height: 120px;
      position: relative;
   }

   .inset-ex {
      writing-mode: vertical-lr;
      position: absolute;
      inset-block: 25px 45%;
      background-color: pink;
   }
</style>
</head>
<body>
   <div>
      <span class="inset-ex">inset-block</span>
   </div>
</body>
</html>

CSS inset-block - auto Value

The following example demonstrates the use of inset-block property with auto as value passed to it, which determines the start and end offset values. The writing mode is also set as horizontal-tb.

<html>
<head>
<style>
   div {
      background-color: purple;
      width: 180px;
      height: 120px;
      position: relative;
   }

   .inset-ex {
      writing-mode: horizontal-tb;
      position: absolute;
      inset-block: auto;
      background-color: pink;
   }
</style>
</head>
<body>
   <div>
      <span class="inset-ex">inset-block</span>
   </div>
</body>
</html>

CSS inset-block - Related Properties

The following table lists all the related properties of CSS inset-block:

Property Description
bottom Sets the vertical position of a positioned element at the bottom.
left Sets the horizontal position of a positioned element on the left side.
right Sets the horizontal position of a positioned element on the right side.
top Sets the vertical position of a positioned element at the top.
inset Sets the physical offsets of an element.
inset-block-end Defines the logical block end offset of an element.
inset-block-start Defines the logical block start offset of an element.
writing-mode Sets whether lines of text are displayed horizontally or vertically.
direction Sets the direction of text, either left-to-right or right-to-left.
text-orientation Sets the orientation of text characters in a line.
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