scroll-margin-left 属性定义了滚动吸附区域的左外边距，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。

{{InteractiveExample("CSS Demo: scroll-margin-left")}}

```css interactive-example-choice scroll-margin-left: 0;


```css interactive-example-choice
scroll-margin-left: 20px;

```css interactive-example-choice scroll-margin-left: 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 { flex-wrap: wrap; }

.default-example .info { width: 100%; padding: 0.5em 0; font-size: 90%; }

.scroller { text-align: left; width: 250px; height: 250px; overflow-x: scroll; display: flex; box-sizing: border-box; border: 1px solid black; scroll-snap-type: x mandatory; }

.scroller > div { flex: 0 0 250px; width: 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; }


## 语法

```css
/* <length> 值 */
scroll-margin-left: 10px;
scroll-margin-left: 1em;

/* 全局值 */
scroll-margin-left: inherit;
scroll-margin-left: initial;
scroll-margin-left: revert;
scroll-margin-left: revert-layer;
scroll-margin-left: unset;

取值

  • {{CSSXref("<length>")}}
    • : 滚动容器的左外边距。

形式定义

{{CSSInfo}}

形式语法

{{CSSSyntax}}