scroll-snap-stop

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-snap-stop は CSS のプロパティで、スクロールコンテナーが可能なスナップ位置を「通り過ぎる」ことを許可するかどうかを定義します。

css
/* キーワード値 */
scroll-snap-stop: normal;
scroll-snap-stop: always;

/* グローバル値 */
scroll-snap-type: inherit;
scroll-snap-type: initial;
scroll-snap-type: unset;

試してみましょう

scroll-snap-stop: normal;

scroll-snap-stop: always;

<section class="default-example" id="default-example">
  <p class="explanation">
    The effect of this property can be noticed on devices with a touchpad. Try
    to scroll through all items with a single swing. Value
    <b class="keyword">'normal'</b> should pass through all pages, while
    <b class="keyword">'always'</b> will stop at the second page.
  </p>
  <div class="snap-container">
    <div>1</div>
    <div id="example-element">2</div>
    <div>3</div>
  </div>
  <div class="info">Scroll »</div>
</section>

.default-example {
  flex-direction: column;
}

.explanation {
  margin-top: 0;
}

.keyword {
  color: darkorange;
}

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

.snap-container {
  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;
}

.snap-container > 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;
}

.snap-container > div:nth-child(even) {
  background-color: #fff;
  color: rebeccapurple;
}

構文

値

normal

スクロールコンテナーの視覚ビューポートがスクロールされた時、可能なスナップ位置を「通り過ぎる」ことを許可します。

always

スクロールコンテナーは可能なスナップ位置を「通り過ぎる」ことを許可しません。最初の要素のスナップ位置にスナップします。

公式定義

初期値normal
適用対象すべての要素
継承なし
計算値指定通り
アニメーションの種類離散値

形式文法

scroll-snap-stop = 
  normal  |
  always

例

様々な軸でのスナップ

この例は scroll-snap-type から複製したものに多少の修正を加えたものです。

CSS

css
/* setup */
:root,
body {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-flow: column nowrap;
  font-family: monospace;
}
.container {
  display: flex;
  overflow: auto;
  outline: 1px dashed lightgray;
  flex: none;
}

.container.x {
  width: 100%;
  height: 128px;
  flex-flow: row nowrap;
}

.container.y {
  width: 256px;
  height: 256px;
  flex-flow: column nowrap;
}
/* definite scroll snap */
.mandatory-scroll-snapping > div {
  scroll-snap-stop: always;
}
.proximity-scroll-snapping > div {
  scroll-snap-stop: normal;
}
/* scroll-snap */
.x.mandatory-scroll-snapping {
  scroll-snap-type: x mandatory;
}

.y.mandatory-scroll-snapping {
  scroll-snap-type: y mandatory;
}

.x.proximity-scroll-snapping {
  scroll-snap-type: x proximity;
}

.y.proximity-scroll-snapping {
  scroll-snap-type: y proximity;
}

.container > div {
  text-align: center;
  scroll-snap-align: center;
  flex: none;
}

.x.container > div {
  line-height: 128px;
  font-size: 64px;
  width: 100%;
  height: 128px;
}

.y.container > div {
  line-height: 256px;
  font-size: 128px;
  width: 256px;
  height: 256px;
}
/* appearance fixes */
.y.container > div:first-child {
  line-height: 1.3;
  font-size: 64px;
}
/* coloration */
.container > div:nth-child(even) {
  background-color: #87ea87;
}

.container > div:nth-child(odd) {
  background-color: #87ccea;
}

HTML

html
<div class="container x mandatory-scroll-snapping" dir="ltr">
  <div>X Mand. LTR</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container x proximity-scroll-snapping" dir="ltr">
  <div>X Proximity LTR</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container y mandatory-scroll-snapping" dir="ltr">
  <div>Y Mand. LTR</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container y proximity-scroll-snapping" dir="ltr">
  <div>Y Prox. LTR</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container x mandatory-scroll-snapping" dir="rtl">
  <div>X Mandatory RTL</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container x proximity-scroll-snapping" dir="rtl">
  <div>X Proximity RTL</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container y mandatory-scroll-snapping" dir="rtl">
  <div>Y Mand. RTL</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

<div class="container y proximity-scroll-snapping" dir="rtl">
  <div>Y Prox. RTL</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
</div>

結果

仕様書

Specification
CSS Scroll Snap Module Level 1
# scroll-snap-stop

ブラウザーの互換性

関連情報