简写属性 scroll-margin-block 设置了元素的块向滚动外边距。
{{InteractiveExample("CSS Demo: scroll-margin-block")}}
```css interactive-example-choice scroll-margin-block: 0;
```css interactive-example-choice
scroll-margin-block: 20px;
```css interactive-example-choice scroll-margin-block: 2em;
```html interactive-example
<section class="default-example" id="default-example">
<div class="scroller">
<div>1</div>
<div id="example-element">2</div>
<div>3</div>
</div>
<div class="info">Scroll »</div>
</section>
```css interactive-example .default-example .info { inline-size: 100%; padding: 0.5em 0; font-size: 90%; writing-mode: vertical-rl; }
.scroller { text-align: left; height: 250px; width: 270px; overflow-y: scroll; display: flex; flex-direction: column; box-sizing: border-box; border: 1px solid black; scroll-snap-type: y mandatory; }
.scroller > div { flex: 0 0 250px; background-color: rebeccapurple; color: #fff; font-size: 30px; display: flex; align-items: center; justify-content: center; scroll-snap-align: start; }
.scroller > div:nth-child(even) { background-color: #fff; color: rebeccapurple; }
## 属性构成
此属性为下列 CSS 属性的简写属性:
- {{CSSXref("scroll-margin-block-end")}}
- {{CSSXref("scroll-margin-block-start")}}
## 语法
```css
/* <length> 值 */
scroll-margin-block: 10px;
scroll-margin-block: 1em 0.5em;
/* 全局值 */
scroll-margin-block: inherit;
scroll-margin-block: initial;
scroll-margin-block: revert;
scroll-margin-block: revert-layer;
scroll-margin-block: unset;
取值
- {{CSSXref("<length>")}}
- : 滚动容器对应边的外边距。
描述
scroll-margin 值表示定义滚动吸附区域的外边距,此区域用于将此盒吸附至滚动口。滚动吸附区域的确定方法为:取变换后的边框盒,求其矩形包围盒(与滚动容器的坐标空间中的轴对齐),再加上指定的外边距。
形式定义
{{CSSInfo}}
形式语法
{{CSSSyntax}}