overscroll-behavior
CSS property sets what a browser does when reaching the boundary of a scrolling area. It's a shorthand for
overscroll-behavior-x
and
overscroll-behavior-y
.
/* Keyword values */ overscroll-behavior: auto; /* default */ overscroll-behavior: contain; overscroll-behavior: none; /* Two values */ overscroll-behavior: auto contain; /* Global values */ overscroll-behavior: inherit; overscroll-behavior: initial; overscroll-behavior: unset;
By default, mobile browsers tend to provide a "bounce" effect or even a page refresh when the top or bottom of a page (or other scroll area) is reached. 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.
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.
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.
| 初始值 |
auto
|
|---|---|
| 适用于 | non-replaced block-level elements and non-replaced inline-block elements |
| 继承 | no |
| 计算值 | 如指定 |
| 动画类型 | discrete |
[ contain | none | auto ]{1,2}
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>
元素：
body {
margin: 0;
overscroll-behavior: none;
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
CSS Overscroll Behavior Module Level 1
The definition of 'overscroll-behavior' in that specification. |
工作草案 |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
overscroll-behavior
|
Chrome 完整支持 63 |
Edge
部分支持
18
注意事项
|
Firefox 完整支持 59 | IE 不支持 No | Opera 完整支持 50 |
Safari
不支持
No
注意事项
|
WebView Android 完整支持 63 | Chrome Android 完整支持 63 | Firefox Android 完整支持 59 | Opera Android 完整支持 46 |
Safari iOS
不支持
No
注意事项
|
Samsung Internet Android 完整支持 8.0 |
完整支持
部分支持
不支持
见实现注意事项。
height
margin-bottom
margin-left
margin-right
margin-top
margin-trim
max-height
max-width
min-height
min-width
overscroll-behavior
overscroll-behavior-block
overscroll-behavior-inline
overscroll-behavior-x
overscroll-behavior-y
padding
padding-bottom
padding-left
padding-right
padding-top
visibility
width