corner-block-start-shape

Constituent properties

The corner-block-start-shape property is a shorthand for the following physical properties:

• corner-start-start-shape
• corner-start-end-shape

Syntax

/* Single keyword value set for both corners */
corner-block-start-shape: notch;
corner-block-start-shape: squircle;

/* Single superellipse() value set for both corners */
corner-block-start-shape: superellipse(2.7);
corner-block-start-shape: superellipse(-2.5);

/* Block-start/inline-start corner, block-start/inline-end corner */
corner-block-start-shape: notch squircle;
corner-block-start-shape: notch superellipse(-2.5);

/* Global values */
corner-block-start-shape: inherit;
corner-block-start-shape: initial;
corner-block-start-shape: revert;
corner-block-start-shape: revert-layer;
corner-block-start-shape: unset;

Values

The corner-block-start-shape property is specified using one or two <corner-shape-value> values:

• If one value is used, it specifies the shape of both block-start corners.
• If two values are used, the first one specifies the shape of the block-start/inline-start corner, and the second one specifies the shape of the block-start/inline-end corner.

Formal definition

Formal syntax

corner-block-start-shape = 
  <'corner-top-left-shape'>{1,2}  

<corner-top-left-shape> = 
  <corner-shape-value>  

<corner-shape-value> = 
  round             |
  scoop             |
  bevel             |
  notch             |
  square            |
  squircle          |
  <superellipse()>  

<superellipse()> = 
  superellipse( <number [-∞,∞]>  |
  infinity                       |
  -infinity )                    

Examples

You can find other related examples on the corner-shape reference page.

Basic corner-block-start-shape usage

HTML

The markup for this example contains a single <div> element.

<div></div>

CSS

We give the box some basic styles, which we've hidden for brevity. We also apply a box-shadow, a border-radius of 40px 60px, and a corner-block-start-shape of scoop notch.

body {
  font-family: Arial, Helvetica, sans-serif;
  width: 240px;
  margin: 20px auto;
}

div {
  width: 100%;
  height: 180px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: goldenrod;
  background-image: linear-gradient(
    to bottom,
    rgb(255 255 255 / 0),
    rgb(255 255 255 / 0.5)
  );
}

div {
  box-shadow: 1px 1px 3px gray;
  border-radius: 40px 60px;
  corner-block-start-shape: scoop notch;
}

Result

The rendered result looks like this:

Specifications

Browser compatibility

See also

• corner-shape shorthand property
• corner-block-end-shape, corner-inline-start-shape, and corner-inline-end-shape
• corner-top-shape, corner-bottom-shape, corner-left-shape, and corner-right-shape
• border-radius shorthand property
• border-start-start-radius and border-start-end-radius
• CSS borders and box decorations module
• CSS backgrounds and borders module