CSS 属性 shape-margin 用于设定由{{cssxref("shape-outside")}}创建的 CSS 形状的外边距。

{{InteractiveExample("CSS Demo: shape-margin")}}

```css interactive-example-choice shape-margin: 0;


```css interactive-example-choice
shape-margin: 20px;

```css interactive-example-choice shape-margin: 1em;


```css interactive-example-choice
shape-margin: 5%;

```html interactive-example

We had agreed, my companion and I, that I should call for him at his house, after dinner, not later than eleven o’clock. This athletic young Frenchman belongs to a small set of Parisian sportsmen, who have taken up “ballooning” as a pastime. After having exhausted all the sensations that are to be found in ordinary sports, even those of “automobiling” at a breakneck speed, the members of the “Aéro Club” now seek in the air, where they indulge in all kinds of daring feats, the nerve-racking excitement that they have ceased to find on earth. 


```css interactive-example
.example-container {
  text-align: left;
  padding: 20px;
}

#example-element {
  float: left;
  margin: 20px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background-color: rebeccapurple;
  shape-outside: circle(50%);
}

这个外边距可以让你调整（浮动元素的）形状边缘与环绕内容之间的距离。

语法

/* <length> values */
shape-margin: 10px;
shape-margin: 20mm;

/* <percentage> value */
shape-margin: 60%;

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

值

  • <length-percentage>
    • : 使用{{cssxref("<length>")}}值，或者相对于元素容纳块的{{cssxref("<percentage>")}}值来设定形状的外边距。

正式语法

{{csssyntax}}

范例

Adding a margin to a polygon

HTML

<section>
  <div class="shape"></div>
  We are not quite sure of any one thing in biology; our knowledge of geology is
  relatively very slight, and the economic laws of society are uncertain to
  every one except some individual who attempts to set them forth; but before
  the world was fashioned the square on the hypotenuse was equal to the sum of
  the squares on the other two sides of a right triangle, and it will be so
  after this world is dead; and the inhabitant of Mars, if one exists, probably
  knows its truth as we know it.
</section>

CSS

section {
  max-width: 400px;
}

.shape {
  float: left;
  width: 150px;
  height: 150px;
  background-color: maroon;
  clip-path: polygon(0 0, 150px 150px, 0 150px);
  shape-outside: polygon(0 0, 150px 150px, 0 150px);
  shape-margin: 20px;
}

Result

{{EmbedLiveSample("Adding_a_margin_to_a_polygon", 500, 250)}}