scroll-margin-block-start

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

scroll-margin-block-start 属性定义了滚动吸附区域在的块首外边距，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。

尝试一下

scroll-margin-block-start: 0;

scroll-margin-block-start: 20px;

scroll-margin-block-start: 2em;

<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>

.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;
}

语法

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

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

取值

<length>

滚动容器的块首外边距。

形式定义

初始值0
适用元素所有元素
是否是继承属性否
计算值as specified
动画类型按计算值的类型

形式语法

scroll-margin-block-start = 
  <length>

规范

Specification
CSS Scroll Snap Module Level 1
# margin-longhands-logical

浏览器兼容性

参见