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The overscroll-behavior CSS property is shorthand for the overscroll-behavior-x and overscroll-behavior-y properties, which allow you to control the browser's scroll overflow behavior — what happens when the boundary of a scrolling area is reached.
/* Значения-ключевые слова */ overscroll-behavior: auto; /* по умолчанию */ overscroll-behavior: contain; overscroll-behavior: none; /* Двойное значение */ overscroll-behavior: auto contain; /* Глобальные значения */ overflow: inherit; overflow: initial; overflow: unset;
По умолчанию, мобильные браузеры как правило обеспечивают эффект "отскока" или даже обновляют страницу при достижение ее верхней или нижней части (или другой области прокрутки). You may also have noticed that when you have a dialog box with scrolling content on top of a page of scrolling content, once the dialog box's scroll boundary is reached, the underlying page will then start to scroll — this is called scroll chaining.
In some cases these behaviors are not desirable. you can use overscroll-behavior to get rid of unwanted scroll chaining and the browser's Facebook/Twitter app-inspired "pull to refresh"-type behavior.
| Начальное значение | auto |
|---|---|
| Применяется к | не заменяемые блочные и inline-block элементы |
| Наследуется | нет |
| Отображение | визуальный |
| Обработка значения | как указано |
| Animation type | discrete |
| Канонический порядок | уникальный неоднозначный порядок, определённый формальной грамматикой |
Syntax
The overscroll-behavior property is specified as one or two keywords chosen from the list of values below.
Two keywords specifies the overscroll-behavior value on the x and y axes respectively. If only one value is specified, both x and y are assumed to have the same value.
Values
auto- The default scroll overflow behavior occurs as normal.
contain- Default scroll overflow behavior is observed inside the element this value is set on (e.g. "bounce" effects or refreshes), but no scroll chaining occurs to neighbouring scrolling areas, e.g. underlying elements will not scroll.
none- No scroll chaining occurs to neighbouring scrolling areas, and default scroll overflow behavior is prevented.
Formal syntax
[ contain | none | auto ]{1,2}
Examples
In our overscroll-behavior example (see the source code also), we present a full-page list of fake contacts, and a dialog box containing a chat window.
Both of these areas scroll; normally if you scrolled the chat window until you hit a scroll boundary, the underlying contacts window would start to scroll too, which is not desirable. This can be stopped using overscroll-behavior-y (overscroll-behavior would also work) on the chat window, like this:
.messages {
height: 220px;
overflow: auto;
overscroll-behavior-y: contain;
}
We also wanted to get rid of the standard overscroll effects when the contacts are scrolled to the top or bottom (e.g. Chrome on Android refreshes the page when you scroll past the top boundary). This can be prevented by setting overscroll-behavior: none on the <body> element:
body {
margin: 0;
overscroll-behavior: none;
}
Specifications
Until the CSSWG publishes their own draft, the specification can only be found in its WICG Github Repository.
| Specification | Status | Comment |
|---|---|---|
| Unknown Определение 'overscroll-behavior' в этой спецификации. |
Неизвестно |
Browser compatibility
| Возможность | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Базовая поддержка | 63 | Нет | 59 | Нет | 50 | Нет |
| Возможность | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Базовая поддержка | 63 | 63 | Нет | 59 | 50 | Нет | Нет |
See also