The CSS shape outside property using function values explained with examples part 2

Following our previous article about CSS shape outside property in this article we explain two more values on this property. The url property and the inset property.

Shape outside inset() function

Basically the full notation for an inset shape function is inset(top right bottom left border-radius). Therefore inset() takes four values for the top, right, bottom and left values plus a final value for border-radius.We could use inset() shape function to create rectangular shapes around which to wrap content:

  shape-outside: inset(100px 100px 100px 100px);
  <em>/* yields a rectangular shape which is 100px inset on all sides */</em>
  float: left;

As an example again the below CSS creates a rectangular shape inset from the reference box of the floated element 20 pixels from the top and bottom and 10 pixels from the left and right, with a border-radius value of 10 pixels.

.shape {
  float: left;
  shape-outside: inset(20px 10px 20px 10px round 10px);

Finally have a look at this pen for a better idea:

Generally in the example above we used border-box as a reference box instead of margin-box:

.element-2 {
  shape-outside: inset(0px 50% 50% 50% 50% 50px) border-box;
  shape-margin: 10px;

So according to MDN float area is computed according to the shape of a float element’s edges (as defined by the CSS box model). This can be margin-boxborder-boxpadding-box, or content-box.

Shape outside url() function

Practically the shape-outside: url(image.png) CSS declaration tells the browser to extract a shape from the image. Also we could use -image-threshold property to define the minimum opacity level of pixels that will be used to create the shape. Therefor we could use 0.0 for fully transparent and 1.0  for fully opaque.

Example from HTML5rocks

As a result of using the url function value the text has been wrapped around the element in the above example:

  shape-outside: url(image.png);
  shape-image-threshold: 0.5;
  float: left;

Although the shape-outside property defines the shape of the area around which content will wrap, without the float, you won’t see the effects of the shape.

In the next article about CSS shape outside we will talk about reference box values. Thanks for reading.

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Azadeh Faramarzi

This site is created and maintined by Azadeh Faramarzi , A passionate developer, sport and code lover who loves to share and write when she has some time.