From 4b1a9203c547c019fc5398082ae19a3f3d4c3efe Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:41:15 -0500 Subject: initial commit --- files/de/web/css/overscroll-behavior/index.html | 104 ++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 files/de/web/css/overscroll-behavior/index.html (limited to 'files/de/web/css/overscroll-behavior') diff --git a/files/de/web/css/overscroll-behavior/index.html b/files/de/web/css/overscroll-behavior/index.html new file mode 100644 index 0000000000..f2a7e10165 --- /dev/null +++ b/files/de/web/css/overscroll-behavior/index.html @@ -0,0 +1,104 @@ +--- +title: overscroll-behavior +slug: Web/CSS/overscroll-behavior +translation_of: Web/CSS/overscroll-behavior +--- +
{{CSSRef}}
+ +

The overscroll-behavior CSS property sets what a browser does when reaching the boundary of a scrolling area. It's a shorthand for {{cssxref("overscroll-behavior-x")}} and {{cssxref("overscroll-behavior-y")}}.

+ +
/* Keyword values */
+overscroll-behavior: auto; /* default */
+overscroll-behavior: contain;
+overscroll-behavior: none;
+
+/* Two values */
+overscroll-behavior: auto contain;
+
+/* Global values */
+overflow: inherit;
+overflow: initial;
+overflow: 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.

+ +

{{cssinfo}}

+ +

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

+ +
{{csssyntax}}
+ +

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 {{htmlelement("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.

+ + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('CSS Overscroll Behavior', '#propdef-overscroll-behavior', 'overscroll-behavior')}}{{Spec2('CSS Overscroll Behavior')}} 
+ +

Browser compatibility

+ + + +

{{Compat("css.properties.overscroll-behavior")}}

+ +

See also

+ + -- cgit v1.2.3-54-g00ecf