The shape-outside CSS property uses shape values to define the float area for a float and will cause inline content to wrap around the shape instead of the float's bounding box.

Initial valuenone
Applies tofloats
Computed valueas defined for <basic-shape> (with <shape-box> following, if supplied), the <image> with its URI made absolute, otherwise as specified.
Animatableyes, as basic-shape
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* Keyword values */
shape-outside: none;
shape-outside: margin-box;
shape-outside: content-box;
shape-outside: border-box;
shape-outside: padding-box;

/* Function values */
shape-outside: circle();
shape-outside: ellipse();
shape-outside: inset(10px 10px 10px 10px);
shape-outside: polygon(10px 10px, 20px 20px, 30px 30px);

/* <url> value */
shape-outside: url(image.png);

/* Global values */
shape-outside: initial;
shape-outside: inherit;
shape-outside: unset;


The float area is unaffected
If one of these is specified by itself the shape is computed based on one of 'margin-box', 'border-box', 'padding-box' or 'content-box' which us their respective boxes including curvature from border-radius, similar to 'background-clip'.
The shape is computed based on the values of one of 'inset()', 'circle()', 'ellipse()' or 'polygon()'. If a <shape-box> is also supplied, this defines the reference box for the <basic-shape> function. If <shape-box> is not supplied, then the reference box defaults to 'margin-box'.
The shape is extracted and computed based on the alpha channel of the specified <image> as defined by 'shape-image-threshold'.
User agents must use the potentially CORS-enabled fetch method defined by the HTML5 specification for all URLs in a 'shape-outside' value. When fetching, user agents must use "Anonymous" mode, set the referrer source to the stylesheet's URL and set the origin to the URL of the containing document. If this results in network errors such that there is no valid fallback image, the effect is as if the value 'none' had been specified.


For interpolating between one basic shape and a second, the rules below are applied. The values in the shape functions interpolate as a simple list. The list values interpolate as length, percentage, or calc where possible. If list values are not one of those types but are identical (such as finding nonzero in the same list position in both lists) those values do interpolate.

  • Both shapes must use the same reference box.
  • If both shapes are the same type, that type is ellipse() or circle(), and none of the radii use the closest-side or farthest-side keywords, interpolate between each value in the shape functions.
  • If both shapes are of type inset(), interpolate between each value in the shape functions.
  • If both shapes are of type polygon(), both polygons have the same number of vertices, and use the same <fill-rule>, interpolate between each value in the shape functions.
  • In all other cases no interpolation is specified.

Formal syntax

none | <shape-box> || <basic-shape> | <image>

<shape-box> = <box> | margin-box
<basic-shape> = <inset()> | <circle()> | <ellipse()> | <polygon()>

<box> = border-box | padding-box | content-box
<inset()> = inset( <shape-arg>{1,4} [round <border-radius>]? )
<circle()> = circle( [<shape-radius>]? [at <position>]? )
<ellipse()> = ellipse( [<shape-radius>{2}]? [at <position>]? )
<polygon()> = polygon( [<fill-rule>,]? [<shape-arg> <shape-arg>]# )

<shape-arg> = <length> | <percentage>
<shape-radius> = <length> | <percentage> | closest-side | farthest-side
<fill-rule> = nonzero | evenodd


HTML Content

<div class="main">
    <div class="left"></div>
    <div class="right"></div>
      Sometimes a web page's text content appears to be
      funneling your attention towards a spot on the page
      to drive you to follow a particular link.  Sometimes
      you don't notice.

CSS Content

.main {
    width: 500px;
    height: 200px;

.left {
    -webkit-shape-outside: polygon(0 0, 100% 100%, 0 100%);
    float: left;
    width: 40%;
    height: 12ex;
    background-color: lightgray;
    -webkit-clip-path: polygon(0 0, 100% 100%, 0 100%);

.right {
    -webkit-shape-outside: polygon(100% 0, 100% 100%, 0 100%);
    float: right;
    width: 40%;
    height: 12ex;
    background-color: lightgray;
    -webkit-clip-path: polygon(100% 0, 100% 100%, 0 100%);

p {
    text-align: center;


Specification Status Comment
CSS Shapes Module Level 1
The definition of 'shape-outside' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 37 No support No support 24 8.0 -webkit
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support No support No support No support No support 8.0 -webkit

See also

Document Tags and Contributors

 Contributors to this page: Tingyu, teoli, Sebastianz, Sheppy, fscholz, una, Braiam, Ugoku, zolotov, rebeccahauck
 Last updated by: Tingyu,